prusik .. or tibloc
also, tiblocs are great, light, tiny, and don't tangle. A prussik might perhaps be more versatile, but the tiblocs are FAST to deploy in these rope rescues. They are also easier when adjusting the floating pulley that is out on the tensioned line.
A complete minimalist pin kit could look something like this:
3 of those pulley/biner combo biners
15' piece of tubular webbing
that's pretty damn compact and light.
I've had to unwrap a raft, 2 hardshells and four IKs in the last year or so. In the majority of cases, it's extremely helpful to have a brake prusik/tibloc on the system. And I agree you can rarely double back all the way out ot the boat. I carry 70' of spectra, and it's been within 10' of too short at least twice.