Comp,
Firstly, I'm sorry to hear you have been left in this situation
but I'll offer as much as I can, as I'm sure others will.
Firstly, moving into the mess early would be a no no as far as I'm aware, even though, as you say the accomodation is much much better. However, if the mess manager is approachable, tell him when you expect to come off the board, and some sketchy details of your circumstances and he may be able to give you a garage long term if available (we use our garages for storage) or see if he has a storage room for inventory and could you possibly use it as a stop gap amount of time and bung him a case of beer for his troubles.
If that is unsuccessful the only other thing I could suggest is to box it all up and ask supply to look after it which I believe they should be able to do.
As far as any other help being offered, I think you are correct in your analysis that you won't get an awful lot, sadly. But maybe someone else can be far more helpful than me!
Good Luck Mate,
Polo