I've got a kit put together by Rocky Auto, it uses what looks to be a type of Suzuki Ignis column and a gearbox speed sensor from jdm-car-parts.com. An electric EPAS column is the way to go imo, much easier to fit than a rack conversion and better feel and fewer drawbacks from what I've read.
The good thing is it uses a smaller motor than the popular Corsa units so it takes up way less room in the cabin and can be mounted the other way (pointing towards the door), basically it doesn't interfere with the air pipes from the heater. It offers a pretty good amount of assistance when standing still too, turning the wheels is a one finger job and of course draws less power than the Corsa motor. Bearing in mind I have 225s on the front I'm pretty happy with it. It uses the same ECU as the Suzuki Wagon R option you mentioned. Not sure of the maximum draw but it's fused for 30A so I'm hoping the 60A 280zx alternator I have will keep up with it alright, otherwise I might have to look around for something bigger.
It had a fault with it when I got it where someone had been fiddling with the calibration pot and put it totally out of whack, only just got it figured out and it's working great now. Ended up buying another Ignis column, ECU and controller module to troubleshoot but didn't even need them
so if anyone is looking to do a conversion I have some working parts that will be going on ebay soon! And thanks Wyn for the help, logged in here to PM you but by a stroke of coincidence this thread popped up
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I've only tested it with the car standing still but the assistance feels perfect; it's not too much but is enough, if that makes sense. I reckon it reduces the effort needed to turn the wheels by about 50% standing still, I've also fitted an override switch so it can be turned off completely and with it off it feels no different to the original column.