Chaps,
Is there no one brewery or distillery (sp?) up there that would be prepared to cough up and have a 'proper' sign made for the place? What about the messes helping out with some cash?
Likewise, can you not get workshops to knock up something about the crew to fix to a wall or something, educating everyone how the name originated? Then maybe get some airship (or even, God forbid, a politician) to 'open the bar' on a visit?
I'm sure there are plenty of places that would give generously to help out if they were told of the reasons.
Best of luck
TSM