Sounds like I'm doing something similar to others:
-Discount store miniature air pump. Removed the plastic covering to expose just the pump, hose, and wires. Cost $13 or so.
-Wired up a jastek plug to the pump after cutting the wires to stretch just enough to reach both tires (about 3 feet max) which connects to a jastek outlet (BMW style) on the side cover, wired as always hot. Cost appx $25, but a standard cig lighter adapter/outlet would be a lot cheaper. Also use the outlet for a troublelight (just an old turn signal wired into a jastek plug, which I'll switch over to LED sometime) in case of emergency at night. Never used it, but it's there just in case.
Also I tote around the plug kit with reamer, plug fitter and rubber cement. Carry them under the seat in a 100oz cut up tide container. I've remove the underseat tray and all the plastic underneath, which creates about 4 liters of space. I believe this will only work for non-ABS bikes, but I can't be certain. Enough plastic removed for the said tide container and the audiovox cruise control unit. There is enough room left over for small tools, toilet paper, tums, aspirin, etc.
Removing plastic also helps draw engine heat away from the tank! Yes, it works very well!
Email me if you want pics