Interesting M'Unlearned friend.
Good luck with trying. Regarding partial capos, I've always been lucky with a shubb, hacksaw, small blowtorch, hammer and sundry anglo Saxon till it worked. (Thinking on, over half my "set" is five string second fret.
Mind you, my mate Brian gave me a factory issue three string shubb capo and I love some of the fun you can have with buggering about with it.