Just depends what rules the FIA lets the manufacturers use. Ford are planning on a small EV that could use the VW floor plan. Ford/ M-Sport might be allowed to throw the fiesta engine into that for entry level rally use, but progressing with the latest car show room shape.
or
The current Puma's wheelbase is 2588mm which is 52mm shorter than the Toyota C-HR 2640mm which in vid was turned into a basic AP4 rally SUV.
I would think the professional European teams will figure out how to make successful next gen entry level rally cars when the time comes.
Japanese AP4 suv there are also Thai , Indonesian SUV AP4s.
https://youtu.be/Uh9ThORSEro