Sounds good. Now wait until night, then carefully remove lid and offer pinky on long forceps (20-25cm or even longer) as suggested, nice and warm from the hot water. You will probably have to tap him a bit to get him fired up and snapping, but just persist for a few minutes and there's a good chance of success. If he does show interest immediately, tongue flicking etc, you could slowly withdraw the pink - I usually find they will snap rather than let the meal escape.
Make sure the room itself isn't too cold - little GTPs are so small they lose heat quickly when exposed to cold.
Good luck and keep us posted!
Jamie.