That's possible but there's some down sides,
1) taking the tanks off the marker wastes all the air that's currently in the marker
2) since the tippmanns do not have on/off ASAs on them its pretty hard on the ASA threads. Yes this is also the case for normal operation but in your case you will be doing it a LOT more than they were designed for. The chances of damaging the threads in the ASA or on the tank are much higher. If you have your players putting the tanks on you are also risking them cross threading the ASAs
3) as a group, your idea MIGHT be faster, I kind of doubt it. Individually it's faster to hook the tank up to the fill station
Here's my suggestion.
Only get 1 or 2 spare paintball tanks. These are just backups
Put the extra money towards a 3rd scuba tank and a fill station for each so you can run a cascade fill system. Here's how that works
You have scuba tanks A,B and C, all starting at 3000psi
Player 1 comes off the field and needs a fill, hook his tank to scuba A, fill. He is done
Player 2 hooks to A fills, probably done
Skipping ahead
Player 5 comes off the field, by now scuba A is starting to come down in pressure so he only gets a 2300psi fill. Fill what you can from scuba A and then hook him up to scuba B to top off the tank.
Player 6, same thing, fill the bulk from scuba A and then top off with scuba B.
The way this works you are only using a small amount of air from the highest psi tank so it can stay fuller longer, you might have to crack open scuba C for the last few but I'd bet you won't need to
So, everyone full, they go out to play, you then hook up scuba A to the compressor while they play. Scuba A fills and now becomes scuba C
What was B is now A, and C is B
You are only having to fill 1 tank at a time
This way I doubt you would even need to run the compressor between each game. It would save a decent amount of wear on the compressor
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