i don't know any special tricks, but here's what i'd try:
CROW BAR! (i'm only half-joking. if you break the battery cover, someone here in the forums can probably hook you up with a replacement, or you could BUY one for as much as £40 and you'd still be getting a FANTASTIC deal on the tablet, overall!)

if it's glued on, maybe there's some kind of solvent you could use to loosen it. acetone? goo-gone (brand name citrus-smelling stuff for getting gum out of your hair and solving other sticky problems)?

again, the price is so sweet that even if you have to pay them before trying to remove it from the stand yourself, and there's a risk of breaking it, it might be worth the risk! if i didn't live in the US, i'd already be there trying brute force on that little guy.

so, i gather nokia manufactured the display stand. is this correct? will they sell you the stand WITH the device? it's not like they have any other use for it, right? you could take it home and carefully deal with it in your garage with your tools and have your friends take a crack at it. that's what i'd do--if i had a garage, that is...
and friends....