Embed Excel VBA script in Powershell Script - vba

Question

I wrote a Powershell script that queries all of my groups from Exchange Online, then gets membership for each of those groups and saves each group to a separate CSV file. This is all working fine.
(Some non relevant parts omitted for brevity):
$excelTemplate = "$($fileLocation)\group-breakout.xlsm"
Copy-Item $excelTemplate "$($tempPath)\group-breakout-$($curDate).xlsm"
# Creating Excel COM Object
$excel = new-object -comobject excel.application
$excelFile = Get-ChildItem -Path C:\temp\group-breakout -Include *.xlsm -Recurse
# Gathering all groups:
Write-Host "Getting all groups from Exchange Online..."
$allGroups = Get-DistributionGroup | select Name, PrimarySmtpAddress, ManagedBy, MemberJoinRestriction
$allGroups | Export-Csv "$($tempPath)\1-AllGroups.csv" -NoTypeInformation
Write-Host "`tDone."
# Gathering members for all groups
Write-Host "Getting members for all groups from Exchange Online..."
$allGroups | ForEach-Object {
Get-DistributionGroupMember -Identity $_.Name | select DisplayName, Alias, PrimarySmtpAddress | Export-Csv "$($tempPath)\$($_.name.Replace("/","-")).csv" -NoTypeInformation
}
Write-Host "`tDone."
# Calling macro in xlsm to merge the created csvs into a Excel spreadsheet
Write-Host "Creating Spreadsheet..."
$workbook = $excel.workbooks.open($excelFile) # Opening workbook
$worksheet = $workbook.worksheets.item(1) # Selecting worksheet
$excel.Run("ImportCSVs") # Calling macro
$workbook.save() #Saving workbook
$workbook.close() # Closing workbook
$excel.quit() # Closing Excel COM Object
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($excel) | Out-Null # Making sure Excel process is closed.
I also have an Excel VBA script access through a COM object that will take those CSVs and add them to an XLSX with each CSV being one worksheet:
Sub ImportCSVs()
Dim fPath As String
Dim fCSV As String
Dim wbCSV As Workbook
Dim wbMST As Workbook
Set wbMST = ThisWorkbook
fPath = "C:\temp\group-breakout\" 'path to CSV files, include the final \
Application.ScreenUpdating = False 'speed up macro
Application.DisplayAlerts = False 'no error messages, take default answers
fCSV = Dir(fPath & "*.csv") 'start the CSV file listing
On Error Resume Next
Do While Len(fCSV) > 0
Set wbCSV = Workbooks.Open(fPath & fCSV) 'open a CSV file
wbMST.Sheets(ActiveSheet.Name).Delete 'delete sheet if it exists
ActiveSheet.Move After:=wbMST.Sheets(wbMST.Sheets.Count) 'move new sheet into Mstr
Columns.AutoFit 'clean up display
fCSV = Dir 'ready next CSV
Loop
Worksheets("1-AllGroups").Activate
Worksheets("placeholder").Delete
Workbooks.Application.ActiveWorkbook.SaveAs Filename:="C:\temp\group-breakout\group-breakout.xlsx", FileFormat:=51
Application.ScreenUpdating = True
Set wbCSV = Nothing
End Sub
The issue I have is having to include the Excel macro-enabled spreadsheet in the script location so I can access it from the script. Is there a way to somehow embed the VBA script in the Powershell script and run it inside of Excel? Or, alternatively, a way to perform the tasks in the VBA script using Powershell directly?