If you can get Mathew Inman of the Oatmeal involved, I'd say yes.....with theses caveats

-the 4 rotor idea is too expensive and complicated to produce to be a tenable design
-the RX-8 had plenty of power what it needed was lightness and 2 less seats to be a sports car
-while Mazda is not producing any more new rotary engines they are still making parts, there is a Renesis remanufacturing facilty just outside of Richmond,VA
-AND Mazda still holds the patent on the Wankel engine design.

Has this idea been posted on RX7Club.com?

Q: RX8 doner with a space frame chassis, who does such things?
A: Factory Five Racing, that's who. https://www.factoryfive.com/
take a close look at their 818, they've got a fastback hardtop coming out this summer, there are several of us talking about dropping a renesis in that.
You get a 100 people willing to preorder a chassis for a new RX7 and talk to Dave Smith (the owner of FFR) I'd be surprised if he said no.
They have several chassis to chose from, 3 FR and 2 MR.