An inflator like the one shown above, should meet your needs. Tire pumps will not generate the volume you need for to fill floats quickly. A tire pump will also wear out very quickly when used for this type of work.
I have had both the hook-up and self contained versions and they work about the same.
Also, I've used one that uses 120 volts and that was the fastest but I would not use it for on-board/on-demand use. You would need to carry an extra piece of gear to provide the correct voltage. There will be a loss of power due to the conversion process and it's one more thing to break. An inverter and real compressor would be more applicable if you intended to launch a squadron of floatables or do some heavy work, but a bit of over-kill for the typical recreational user.
Good luck, have fun!
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