I would also be very interested on this topic, as I have a 145 project waiting attention, and PS would be so much easier for the better half to use.
I had looked at a couple of suppliers
https://easysteer.co.uk/
https://www.ezpowersteering.co.uk/
https://www.holden.co.uk/blog/ez-ele...ower-steering/
Holden say prices from £1200 ish…….
Cheers
Steve