While it looks like a "decent" pump, until it can pump as many kites as say the whole hatteras house gang its just not there yet. Its not like pumping a kite manually takes more than what? A couple of minutes! If your cant pump up a kite, you shouldn't be kiteboarding. How competent are you going to be when things get compromised and you have to self rescue or swim in? Its not like you gotta paddle out into the line up or anything!!!
The proliferation of gadgets like... the go joe, the real leash, the pump handle extension, the electric pump are all sad signs that the kiting demographic has got a whole lotta LAME to it.
I'm all for a compressor in the truck or at the cottage or waterfront home, and I'm not against better pump designs, but I'd rather see some brains go into a pull chord pump that spins a cylinder type pump that weighs next to nothing is the size of your fist cause it has no large chamber and you can pump while standing upright a reality rather than something battery powered.
Someone with enough effort could work with this principle and pull it off.