Clayton - my answer would be yes. Don’t know quite what the requirements are for home brew O2 but an O2 concentrator is pretty handy. It is a bit noisy and is a bit of a power hog, requiring at least 500 watts for the smaller one. The most efficiency albeit expensive option would be to have an O2 concentrator and a high pressure O2 compressor to fill your tanks. Generate some O2, fill a tank, use prn. These were common years ago but the whole rig would probably cost $1000 used, not bad if you req’d tanks.
These days, battery O2 concentrators are common and an amazing technology and, I believe, have replaced the small, portable tanks that have been lugged around. Still, I would love to find a cheap rig to compress O2 from my concentrator to 2000 psi. Would not be ‘medical grade’ because it would only be around 95% but this is fine for all medical apps that I know of or that I need.
I might be wrong but feel certain that all O2 supply, commercial or medical is totally oil free in all stages of filling, storage and dispensing. High partial pressure of O2 + oil + temp is a formula for combustion as in a diesel engine and thus I suspect that is why one never uses oil in compressed O2 rig. I don’t think that 2000 psi plus oil alone at room temp will ignite but you have an oxidizer plus a fuel and temp is the other ingredient. I suspect there is an interesting data curve that shows where ignition occurs with oil, O2, pressure and temp.