I would probably use steri strips for closure then try and put a bandaid (a fairly large that would rap all the way around the finger and then stick to itself to make a ring) or some other dressing (sterile gauze/tape) on top of that then worn a glove or bandana over the bandaid. Of course then you might get sweaty, I guess it depends on the weather…The key to making things stick will be getting it clean and dry prior to sticking since no ultralighter would carry something to increase adhession (heaven forbid we add 1/4 an ounce to make our bandaids stick well heh). It would still be tricky because the back of fingers are a dynamic area that stretch and pull and the skin moves a lot. Keeping it covered (clean) would be my primary goal, and this would probably be easiest with some sort of bulk dressing.
Anyway, you seem to have made it out w/at least one of your hands (you can still type) so I guess you did ok!

