6: One I'd like to try and might work: Wear a rubber glove and put some ice inside the glove. It hurts at first but the gradually wears off as the ice melts. (Probably best to put the ice in a rubber glove itself, so that you don't hurt your hand and don't end up with a wet patch on the bed.) Can imagine it working with WBTB and MILD.

If anyone tries it, let me know how you get on.