Whels, you're a good guy, but I think you lost it on this idea.
How's this for a solution...
Know your aircraft's fuel economy, calculate how much fuel will be required to accomplish your mission, monitor your fuel capacity while in flight, and RTB when your fuel reaches your pre-determined 'BINGO' point.
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The one and only way I would even think this is remotely a good idea would be for actual fuel trucks to be available which could spawn from a re-arming point. The truck could be driven (by another player) to your aircraft where it could be given more fuel.
In this case, it would be to save a fellow pilot from receiving a ditch when they landed at/near a friendly field but didn't have enough gas to actually make it to the re-arm pad.