cRiPpLe_rOoStEr --
Permalink #13.
Should be biking -- Everything you describe is needed for any electric installation, hybrid or pure EV. At Permalink #5 I pointed to the thread on installing the Toyota MGR. I don't think anyone has succeeded, at least with MPaulHolmes' Open Revolt controller. I wanted a pure EV install in my Beetle, but it is as you describe.
The easier option would be an GM E-assist altermotor installed on the MR2 ICE replacing the alternator and starter.
ecomodder.com/forum/showthread.php/controller-mods-build-e-assist-altermotor. You can get by on 72-115V, much less expensive and dangerous.
But the ask is for four-wheel drive.