You don't have took to the America. Dakar does the same already. Anyone can build car there with variety of engines. And there are a lot of entries from various makers, privateers, or tuners.
For example, Martin Prokop is building his Ford Raptor in his team. Well if a privateers can build Dakar car, I'm sure that huge teams like Prodrive, GCK or Oreca will be able to build Rally1 car.
Since Rally1 cars are not proper rally cars those organisations you mention can do this already (if they can fund it and find a manufacturer to stick their badge and headlights on it)
It shows how they arent short of money though but very late, as for 2022, in deciding whether to use it on WRC. They've clearly learned nothing from the past unless it's all just a delaying tactic...
Sainz sends warning to Williams over 2028 ambitions: "How long am I willing to wait?".
Carlos Sainz has admitted he is considering how long he is prepared to wait for Williams to return to the front...
never been about money. it's (always) all about getting something back from competing (aka investing money for a reason).
Hyundai WRT