Sorry to hear the extra keys won't work as-is. They didn't have to disable those codes, did they, just because it was unlikely someone would go to the trouble to get an actual terminal board? Sheesh.
Will your admin let you install a macro app like
WinKey? Then you could program your extra keys to do whatever you wanted, including simulating the combinations of standard keys I assume you're expected to use instead—and you could have the last laugh.
As far as it being "too big"—does it actually hang over the front of your desk? Even if it does, you could cut a piece of 1/2" plywood to the right size, paint it black, and attach it to your desk as a base. The 122 looks so tough (old slang for "cool"), I'd go to extra lengths to try to keep it there... But that's me.