I did use paintball canisters for while with a mini regulator designed for use with hydraulic tools, such as a nail gun.
(JacPac J-6901-91 Portable Compressed CO2 Pneumatic Regulator Kit [Misc.] [Misc.]: Amazon.ca: Patio, Lawn & Garden)
It worked great but from time to time, the rubber O ring on the CO2 would give out and I would lose all my CO2 as soon as I connected the bottle to it.
When it worked, it worked great but I got a little frustrated with it after a while. I was even able to refill the paintball canisters myself off my 20lb tank.
If you’re interested, I would be more than happy to sell you the regulator and the tanks (I think I have 3) and you could give it a shot. I rarely bring kegs anywhere anymore and when I do, I just bring a full 20 liter keg and a 20 lb CO2 tank. But I must admit, the 10 liter keg with that little regulator was great for parties.