Is there a way to change or add a reference to a template for a Word document?

The reason I ask is that we have code that copies in our firm styles to documents created before those firm styles existed. It isn't working, however, for documents created from the scanner or emailed to us. At that point we get a
Microsoft Visual Basic
Run-time error '9541':
The requested member of the collection does not exist.

I am over my head on this one, but the firm does not want to pay developer costs...

Code:
Sub CopyFirmStyles()


    UpdateNStyles

    If Not InstantiateFormsAssistantUI() Then Exit Sub
    goFormsAssistant.CopyFirmStylesFromBlankTemplate
    
End Sub

Sub UpdateNStyles()
 
     'I wrote this  
    RenameNstyles
    CopyNstyles
     
End Sub

Sub RenameNstyles()
 
    'I wrote this
    'Renames the existing NCHC styles to N...
     
    Dim OGstyleName As String
    Dim NewStyleName As String
    Dim ChangeStyle As Style
    Dim StylePrefix As String
     
    StylePrefix = "NCHC"
     
    For Each ChangeStyle In ActiveDocument.Styles
    'reduce the number of loops by only checking paragraph styles
    
        If ChangeStyle.Type = wdStyleTypeParagraph Then
            OGstyleName = ChangeStyle.NameLocal
            
            If (InStr(1, OGstyleName, StylePrefix, 1) = 1) Then
            
                NewStyleName = Mid(OGstyleName, 5)
                NewStyleName = "N" & NewStyleName
                ChangeStyle.NameLocal = NewStyleName
              
            End If
        End If
    Next ChangeStyle
 
End Sub

Sub CopyNstyles()
  
    Dim Blankdot As Document
    Dim Thisdot As Document
    Dim NewStyleName As String
    Dim CurrentStyleName As String
    Dim AddStyle As Style
    Dim StylePrefix As String
    Dim TemplateString As String
    Dim StartNInt As Integer
    Dim EndNInt As Integer
    Dim NIntFound As Integer
    Dim CounterInt As Integer
    Dim IntHolder As Integer
    Dim MIntFound As Integer
    Dim TestInt As Integer
     
     
    TestInt = 0
    NIntFound = 0
    StartNInt = 1
    StylePrefix = "N "
    MIntFound = 0
     
    Set Thisdot = ActiveDocument
     'modified for citrix compatibility

    TemplateString = FullTemplatePath("Blank.dot") 
   
    'changed to make the file invisible and not add to list of recent files
    Set Blankdot = Documents.Open(TemplateString, , , False, , , , , , , , False)
          
    EndNInt = Blankdot.Styles.Count
     
    Documents(Thisdot).Activate
     
    'Look for styles in blank.dot that are appended with "N "
    For Each AddStyle In Blankdot.Styles
     
        'Test for style found in current template
        TestInt = 0
        
        NewStyleName = AddStyle.NameLocal
     
        If (InStr(1, NewStyleName, StylePrefix, 1) = 1) Then
        
            'Look for this same style in the current template
            For CounterInt = StartNInt To EndNInt
            'In Thisdot.Styles
            
                CurrentStyleName = Thisdot.Styles(CounterInt).NameLocal
                
                'Test to see if this should be our starting point from henceforward
                If NIntFound = 0 Then
                
                    If (InStr(1, CurrentStyleName, StylePrefix, 1) = 1) Then
                
                        NIntFound = 1
                        IntHolder = CounterInt
                             
                    End If
                    
                Else
                
                    'Test to see if this should be our ending point from henceforward
                    If MIntFound = 0 Then
                    
                        If (InStr(1, CurrentStyleName, StylePrefix, 1) <> 1) Then
                    
                            IntHolder = CounterInt
                            EndNInt = IntHolder
                            MIntFound = 1
                                                
                        End If
                        
                    End If
                    
                End If
            
                If CurrentStyleName = NewStyleName Then
                
                    'Style was found in current template, so exit loop & flag style as found
                    TestInt = 1
                    
                    Exit For
                                                    
                End If
                
            Next CounterInt
                    
            'If style not found in current template, then copy it in
            If TestInt = 0 Then
                            
                Application.OrganizerCopy Source:= _
                TemplateString, Destination _
                :=Thisdot.AttachedTemplate.FullName, Name:=NewStyleName, Object:= _
                wdOrganizerObjectStyles
            
            End If
        
        End If
        
        If NIntFound = 1 Then
            
            StartNInt = IntHolder
            
        End If
                    
        Next AddStyle
        
        Documents(Blankdot).Close
        Documents(Thisdot).Activate
     
End Sub

Function InstantiateFormsAssistantUI() As Boolean
'I did not write this
    
    If DEBUG_MODE Then On Error GoTo 0 Else On Error GoTo ErrorHandler
    
    InstantiateFormsAssistantUI = True
    
    If Not (goFormsAssistant Is Nothing) Then
        Exit Function
    End If
            
    ''' Set goFormsAssistant = New pcgFormsAssistant.UI
    Set goFormsAssistant = CreateObject("pcgFormsAssistant.UI")
 
    goFormsAssistant.SetWord Application
    
    Exit Function
    
ErrorHandler:
    MsgBox "An unexpected error has been encountered." & vbCr & vbCr & _
        Err.Number & ": " & Err.Description, vbExclamation + vbOKOnly, "Forms Assistant"
        
    InstantiateFormsAssistantUI = False

End Function

Public goFormsAssistant As Object ' pcgFormsAssistant.UI
'I did not write this
I have no idea where goFormsAssistant is getting methods or properties. I don't see any objects in this project.