The Prius, especially in Gen1 form is a hybrid, it's electric motor was originally designed for maybe a 20% duty cycle. If you try going down the full EV route you can be quite certain that the OEM motor won't last.
I'd suggest keeping your diesel for out of town trips, and building a DIY EV (if you want to haul fridges maybe a Citroen Berlingo). If it's only used around town you can start with just a small/ cheap LiFe battery and extend it when you can. If you start with a gen 1, you'll need to swap out the motor/ controller and batteries anyway, you may as well start with whatever car you want (and getting one with ICE/ trans problems will be cheaper).
Another option would be to swap your diesel engine to a later Euro X standard.
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