To start, dental floss and some good, strong needles. Add a GOOD thimble. Few feet electricians tape. Some zipties, maybe a little rawhide. A pair of good manicure scissors and a pair of toenail clippers. You've got wire, duct tape and safety pins already.

Steping up from here is some upholstry thread or a good braided fishing line like Spiderwire, 20#- add a little bit of bees wax, it helps. Some curved needles, and a couple small hemostats. Maybe a roll of vet wrap (I like blaze orange or nuke green or hot pink- then you can use it strips for flagging).

Then a good awl needle, with a pin vise for a handle. Once you have the pin vise, look for precision driver bits and a long, stout iron rod that fit. The rod gets pointed- add a couple of paper clips to make a stand, and some low temp electronics soldier. Heat the tip with your lighter and work fast.

A 3-4" length of bicycle innertube and good rubber cement is always nice.

So how crazy do you want to get?