And that my friend, is why you need a dive tank!
So, even if you had a 4500 system, she couldn't fill it to that could she?
Go 3000 psi. With a Melee from Jackie at AGD (Powerpulse) ring her tomorrow she's very helpful and knowledgable.
Then try to find a seconhand 12 or 15 litre dive tank.
Check the Air Gunner or Gun Mart magazines. a company does refurbished tanks with dry valves (not wet ones that divers use) which means the bottle doesnt have to be tested so often as its not submersed. You will need a fill station as well. Jackie can help you with all of that. If you can afford a 300 bar bottle get one, I cant so didnt.
Gaz
P.S. Every two games for a fill dont sound too bad for sup air, seeing as the amount of paint you probably shoot.