So, what to do? Stranded without a electrical charging system and no means of getting another one for some time.
Out with the sheet steel, sharpie markers and masking tape. I am, after all, a child of the Blue Peter generation.
Who knew that the internal circumference of the average roll of masking tape is precisely the same diameter as an alternator pulley?

I'll be honest, I did actually "cheat" and use a vernier gauge, scribe etc. This is precision bodging after all. But it was still done on the driveway...

The final piece welded in place, it very well balanced and has been on for over 250+ miles so far. Has been slightly fettled since that photo.

That is the KR running again for now until it gets pulled for an ABF. Picked up a crucial bit of kit for it this evening too after hunting about for one for a while now.
Pics and details to follow but I'm almost ready to go. Just need to get a loan of the lock up as don't fancy doing this on the driveway.