MMMM... good question. Likely anything will do, I would assume a silicone lube.
I have plenty of spare parts for pumps from warranty pumps I have collected...if you want to make a Frankenstein pump....maybe a Hooka pump so you can pump up 3 kites at once.
Windzup,
Brian Schenck
Excitement, adventure... a Snowkite Jedi craves not these things.