A gas leaf blower does indeed do the job for about $120 and should still fit in a rocket box, along with the usual repair bits and tools. You can buy a quart of premix gas in a metal bottle that is ethanol free or upgrade the plastic fuel lines; Those little gas engines run just fine otherwise. The ethanol free premixed gas is stunningly expensive, but one could justify the cost with "yeah, but you get a nifty metal bottle along with the gas and it's premixed".
"Mighty Blow" is noisy, stinky, and demands gentle treatment, but for blowing up several boats (or deflating if you fabricate a suck attachment) they cannot be beat. One quart of gas can keep a fleet of leaky pontoons stiff for an entire Grand trip. I know this from experience. Battery blowers might work, but I'd be worried about a dead battery and/or a lack of spirit from the thing as the battery runs down.
I have heard, but never verified, that those gas engines will run, for a bit, on camp gas and will require cleaning afterwards, another point in their favor if true. I mean, if they will indeed run on camp gas in an emergency, maybe they will also run on everclear?
Someone needs to investigate............