Very much doubt we will see the likes of Ford/VAG doing a ground up homologation special. Ford struggled to get MK3 FRS signed off, then it has constrained by a tight budget. Which is a bit crazy, as if they or anyone that builds the "right" car then it will sell. The RS had to have about 2 or 3 production extensions to meet demand and the GRY is selling out, orders now are delivery in May 22. So the evidence is there.
Minimum Ford should do a proper Fiesta RS, I'd cancel my GRY order then and get one.