You’re thinking of butane, as in lighting it. Butane, propane, isobutane and other flammable hydrocarbons are often uses propellants in aerosols. It has a larger molecular weight than CO2. Purmate lists properties for aerosol propellants.
It’s’s what I would try, but then again I wonder how I’ve managed to keep both my eyes over the years. I’d start by emailing the guy who posted the video above.
CO₂ might also be viable, but I don’t know how the valve assembly works on the vehicle.
You got my mind wondering about this. I wish I had known about these when I was younger.