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I have fitted two removable steering wheels now, one to my Europa, and the other to my Seven.
On the Europa, I went with the bolt-on solution. Lifeline makes a QR adapter for Moto Lita Steering wheels. It moves the steering wheel roughly 2" closer. It is a very simple install except for wiring up horn button.
I modified the horn wire from this:
And made up my own horn button with a spark plug boot, spring and brass nut:
It all work perfectly.
On the Seven, the horn button is on the dash and space is tight, so I went with a weld on system. I bought a used, upper, steering shaft section of the 'bay for the conversion. I modified an original steering wheel to keep it looking stock.
Here's a video of removing and refitting the wheel. It really is as slick as that:
https://jbcollier.smugmug.com/Lotus-Seven-S3/i-FhtPvtf/A