I have been thinking about this and had a dream last night that was good enough to remember. Build a shotgun for 410 gage shells and make it look and work like a frame pump! The barrel could easily be threaded on both ends for the adaptor to hold the 410 shell and a pull back and release hammer to shoot it. The other end would have a small plastic disposable cover (that can be shot off), which would also be the adaptor for holding the pump in the frame mounts. When you actually need the pump you remove the shotgun parts by unscrewing them and replace with pump parts of the kit so the barrel becomes a real air pump with check valve and short hose on one end and a pump handle and piston on the other. I have a metal lathe and mill so I could whip one out in a jiffy.