If it were me, I'd go with an HPA tank, either a SCUBA tank or a large paintball air tank. That's the problem with pneumatics and even higher mix hybrids: you gotta get an air supply out to your shooting area. I use low mix hybrids and a regular bike pump. In your situation I'd go with HPA because I...

I have done test with sprinkler valves, duel sprinkler vales, triple sprinkler vales, piston vales, and ball valves. I have surprisingly found that a basic ball valve performs the same if not better than the triple sprinkler valve system. I built a 2'' piston valve but never really recorded anything...