But which option weighs what?
You can replace the motor with electric and still have the rest of the driveline the same, plus flatteries (would be a lot heavier)
Or my preferred option when someone manufactures it (and someone else other than me pays for it) is throwing out the whole drivetrain and replacing with axles with twin motor units front and rear so full independent drive on each corner.
By my thinking your ditching engine, gearbox/tcase and weight of diff gears and also remember no 100 kilos of fuel + jerrycans for 4 motors in a straight swap out bolt in assembly. (maybe lighter conversion than retaining old driveline?)
There are a squillion beam axle vehicles out there ripe for converting.

