At VBA side the code is clean and highly manageable.

Sub RunModule() Dim eng As New ASF

    ' Set working directory
    eng.InjectVariable "wd", ThisWorkbook.Path
    
    ' Execute module file
    Dim result As Variant
    result = eng.Execute(ThisWorkbook.Path & "\main.vas")
    
    Debug.Print result

End Sub

ASF isn't just a framework, is a modern language that we can run inside VBA.