What you want is economies of scale. You need to be able to design a drop-in replacement that works for millions of vehicles, not one-offs for 25,000 vehicles. An electric conversion will be made fairly early for the most popular vehicles and everything that uses the same engine (eg, Accord, Camry, Jetta). The Mazda rotary engines will not. They’ll end up being taxed to death, unless someone can make cheap adapters.
