Do you mean taking an existing ICE frame and making an EV version? It happens. The Mini Cooper EV is a Cooper S with the guts from the BMW i3 dropped in. They changed as little as they could get away with. They even left the hood scoop on.
Meaning it can be done. I don’t think there are that many engineering challenges to overcome. If the main obstacle is money, perhaps stopping the subsidies to Big Oil would help?