Draken said:an ASA is just a small part that the CO2 tank screws into, some are direct pin pushers (not what you want) and some have on/off valves (what you want)
Could go this route and have a host already on it, just screws onto the tank and has an on/off already built in, or could go this route and design your own nozzle system for it, all fittings on this are 1/8 NPT and easy enough to find in any hardware store
How is the first one supposed to work. I dont even have a mild clue how the second one is supposed to work.