Here's the old set up.

I bought a Corsa C link and seperated the top UJ keeping the bearings and rollers.

Then swapped the top piece of the E30 link back onto the Corsa link. I reused the bearings saved from earlier and restaked them into the aluminium with a punch.

With the car on axle stands and the plastic cover panel below the engine removed I was able to pull the steering rack forward enough to free the old link and swap the hybrid Corsa/E30 into place.
The rack needs a little grinding to allow the pinch bolt through the lower clamp, the top piece is E30 so pushes straight on.
The lower clamp also needs a bit of work with a round file to get it to slide over the splines on the rack - there is one thick master spline that needs removing but it is fairly easy to file it away.

I can see now I need to push the top piece further onto the column splines. The Corsa part is telescopic so that's no problem.

