Ventilator advice, please.
1. Hair dryer
2. Leaf blower
3. Small child + bicycle + old-fashioned bellows
4. Pulse oximeter, oxygen tank(s) with piece of plastic tubing, sturdy plastic bag, duct tape, cloth ties to gently fasten bag over your head and around your neck. Ideally you would have a foot pedal mechanism where you could push a bit more oxygen yourself as needed. Otherwise you'd need someone else to dial it up or down for you.
I do know the oxygen tank system quite well - you can get up to 8 liters per minute in home environment, but don't light any candles nearby! You can get up to 15 liters per minute from some tanks - normally in hospital but maybe some on shadow market these days. Even 2 liters per minute is a pretty good hit for such things as moderate COPD, just to give you a benchmark. (Not me, just so no one jumps to conclusions!)
Alternatively, start taking your sports car apart and seeing what can be adapted. All of the automakers are trying to retool - what they do have is tubing, compressors of a certain type, and O2 sensors, especially fine tuned ones in high performance vehicles, I would think.
But if you are really feeling hot and breathless, maybe turn the Hub off for a little while? Too much of a good thing....