Yes, i was thinking that is what i will have to do for now.
I went to a local scuba shop today to ask about what tanks they had, only yo realize they could not even fill to 4500psi if i bought a bottle, they said they run their pump to 3600psi tops.
So i called around to some paintball shops in a 40 min range and found similar answers.
I did find some carbon fiber scba bottles on Craigslist for 45 dollars, and a place to hydro test for the same $, but that still leaves the need for air at 4500psi.
So it seems a Hong yang pump will be needed.
It seems like a pretty good option for direct filling too, allowing me to save up and buy a less sketchy tank from AOA in the future, so i can be more portable.