mnealtx,
Here is a link to a very simple one that should work. The load is the atomizer wires.
I haven't cross referenced the FET listed yet and it may work fine at our voltages, but I have 2502' and 6401's if someone wants to give it a try before I can get to it. They will work in the same voltage range as our PV's. The rc gear I used them in used Li Poly batts , the same range and cutoff.
I don't have a failed switch yet, but I can see where it would be a neat substitute.
The contacts should be recessed or covered, when not in use, to prevent accidental "on's".
The 4.7m resistor can be a lower value as long as it allows the FET to turn on. All it's doing is keeping the FET off during idle when the contacts aren't being touched.
Circuit - FINGER TOUCH ACTIVATED SWITCH - Circuits designed by David A. Johnson, P.E.
Maybe I can solder one up in the next day or so.
Hope this is what you guys are looking for.