Hit your local costco or a place that sells inexpensive air pumps that actually create 80psi or better?
Hook that baby to the battery of your kite rig.
Buy a cheap air tank (lots of places have these traveling chinese tool sales tanks can be like 20$ with everything including hose the catch is you may find the hose is too cheap and want something more flexible like a true rubber one the pvc's are pretty brittle and super stiff.
hook up the compressor to the storage tank. (if you got a decent compressor it should have a tire nipple that screws on to the storage tank)
This next part is up to you if you're scared of high psi coming out you could grab a pressure regulator (will take longer to fill and pressurize the bladder.
Get a blow gun and hookup to your in valves give a few squirts voila you have a pumped up kite for no effort.
If you wanna get portable i know the tanks can get heavy but a 10 gallon tank filled to 120psi or more should be enough volume to fill even a 16meter kite.
