That said, I'm loathe to yank off keys just to clean them, especially after such a short ownership.
It's pretty easy and safe; I've done so many times on my Psions, with no ill effects, and the Gemini keyboard seems to work the same.
The best way I found is with a blob of Blu Tak or similar. Press it down firmly on the key, the lift it away sharply; the keytop usually comes away with it. (Unlike levering it off, the keytop comes up straight, and there's no risk of it being damaged by any tools.) Take care with the Enter and space bar, as those are attached to metal bars underneath.
Once the keytop's off, you can reuse the Blu Tak to remove any dust or other debris from underneath. (There's always some…)
If you're removing many keys at once (which is the best way to clean it out), you'll need some way to identify which ones go back where! If you can't remember the layout, get a picture, or fire up a text editor and press the rubber ring underneath each key to check which character it produces.