This week I watched Vintage Voltage - where they converted an MG Midget to electric. They did admit that the drivetrain was as expensive as the whole rest of the restoration. (The Midget world was all atwitter because over the years of Midget production the front signal lights were mounted at two different heights on the fenders - this car had one of each leaving it looking cockeyed - a rookie mistake)
Probably teaching granny to suck eggs but, the Henney Kilowatt was a Dauphine conversion. Only 47 cars were made. en.wikipedia.org/wiki/Henney_Kilowatt
In 2000/2001 Feel Good Cars in Canada began production of an electric Dauphine.
Unfortunately they never really got anywhere and ironically the cars would not have been legal for Canadian Roads even if they had gone into production.
The company abandoned Dauphines and went for (I think) a Chinese Electric car (also not legal in Canada) - I don't believe the company exists any longer.
The connection is that a fellow car club guy (who had a yard full of LBCs including a couple of Vauxhalls) told me about a neighbour. The neighbour had two DS's in his driveway and a bunch of Dauphines in the back 40. I went exploring and, indeed he did. This was at least a decade ago, none were licensed for Canada and I suspect it was the graveyard for the proposed electric conversions. All of which is to say I am much more interested in retro.
Great idea??? wonder why no one else has thought of it. Must be the most polluting EV in existence. Still Mazda is bringing back the rotary as a range extender