Hey izeman, just wondering how you made out? those little switches I linked have come in, and man they are small!
Haven't tested @ pack voltage, and not 100% on how to mount and electrify, but shouldn't be too bad. They measure 10x10mm, and can be mounted thru something with a 7mm hole and 5mm protruding. Very easy to waterproof, and cheap. separate switches are not what you were going for though.
ps, the pa09 and the jst set came. Wow, nice crimpers and jst's to last forever!