You could try resetting each footnote using a macro
Code:
Sub Macro1()
Dim oFN As Footnote
For Each oFN In ActiveDocument.Footnotes
oFN.Reference.Select
With Selection
With .FootnoteOptions
.Location = wdBottomOfPage
.NumberingRule = wdRestartContinuous ' wdRestartPagewdRestartSection
.StartingNumber = 1
.NumberStyle = wdNoteNumberStyleArabic
.LayoutColumns = 0
End With
.Footnotes.Add Range:=Selection.Range, Reference:=""
End With
Next oFN
Set oFN = Nothing
End Sub