I have used a 3000psi bottle of air for many years as an air source at the track. Pumping tyres, running air guns etc. In this part of the world, you can only hire the tanks, so there is an ongoing cost.
With the advent of good battery powered rattle guns, I no longer use any air tools.
Perhaps the new Makita 18V tyre inflator could be useful. https://www.youtube.com/watch?v=2rz1FFjPKd0
Anyone used one of these?