Efficiency would certainly be pretty rough but wire’s been around since about 2,800 BC. Copper would be the way to go if you could manage it but any conductive metal would get the job done to some extent.

Finding a reasonable safe insulator might be a little bit of a chore.

Soft metal bushings have also been around for a really long time.

Efficiency on magnets would be difficult, You might want to just use a really huge battery pile and electromagnets.

The manufacturing tolerances for the axle the wire and everything would be a fight.

I don’t think you have a chance in hell of producing anything in the same efficiency range is what we have today, but compared to not having electricity at all… It might be worthwhile.

The thing is even if you make the electricity what the hell are you going to use it for? For light bulbs are going to need glass blowing in inert gases. You’re going to need diodes resistors capacitors and transistors to do radio, You could probably usher in tubes but that shi*'s almost black magic as it is.