Haven't heard of it, and my initial reaction is that it would be a silly and pointless thing to do, in that the increased downwash and greater likelihood of fuel spills/catastrophic accidents would make any perceived benefits not worth the added risk, particularly if you consider that if there's enough room to put a fuel supply somewhere, there's a good chance you could also land a helicopter there.
On the other hand, if there was some absolutely life and death reason that it was needed, some kind of sealed pressure refuelling system could probably work.
Maybe the yanks have already done it, they seem to trial all kinds of weird and speculative stuff 'just in case'.