Bugs in January?
You must be someplace warm. Ain't no bugs around here in January, and yes I do go tent camping in the middle of winter. No need to worry about bugs or keeping the keg cold, mother natures got it covered.
I think your putting too much time and effort into bugs. You may think that your beer is the best thing on earth and everybody in thier brother wants some. Bugs got a different perspective. You wont have any problems if you keep the tapper off the ground. You may get an ocasional fly or two stopping on the tapper, but that is no worse than them stopping on your glass. When your not drinking, rst the tappr on top of the keg. As long as you dont store the keg on a ant hill you wont have any problems.
As for backpacking, everclear is a great option. We use it for cooking fuel, and medicianal purposes. If you need a shot of something a little less potent, bring a flask of whiskey/burbon. Beer weighs too much for backpacking.