RF is no good, and neither is a USB->Bluetooth dongle -- it needs to be completely wired. This isn't just a draconian IT policy that can be skirted, and a physical audit is pretty much guaranteed in a few weeks.

I just posted on Macrumors asking about the Adesso AKB-440; I'll see what they say.

The Bamboo Touch combined with a regular old keyboard is probably an acceptable Plan B if nothing else works out.