I built a ghetto inflator for the project, tbh it wasn’t any better than a good track pump. I don’t mean a quality track pump, I mean one that’s good at tubeless, a Joe Blow Mountain or similiar. Lots of very nice track pumps don’t shift air fast enough to be good at tubeless, you need some girth. I know folk swear by the bottle inflators but I wouldn’t bother.
Had a go with an airshot the other day, it’s very effective for a short burst, like the flash pumps and the like, I was impressed. But where a compressor wins is duration- if you’ve got a bad tempered tyre you can blast it with air for a long time while you fanny around trying to persuade it onto the beads. Gamechanger really, nothing else can do this. I wouldn’t expect to inflate my fatbike tyres with an airshot frinstance.
But then the portability of my compressor is obviously terrible! So option the 4th- I got a fire extinguisher and built a cheaper, bigger Airshot. It needed a little ingenuity to do but nothing too tricksy, and it has many times the volume. There’s obvious downsides to having a fire extinguisher full of compressed air, if anyone ever tries to use it to put out a fire… And it takes a long time to fully charge with a pump for the same reason that it can discharge for a long time. But it is a good balance imo.