Out of curiosity, as long as you don't cut the traces, you can dismember the membrane in a model M as much as you want, can't you?
If that's the case (and we can always try and find out), why couldn't we just sort of mod one into a HHKB sized mini? If the traces are flexible enough after mutilating them, we might even be able to swing around a pad for use as a function key.
I'm just thinking out loud here. It would require a new controller to be really feasible, though.
Or, hmmm...what about microswitches under the hammers instead of a membrane? You could make whatever layout you wanted. But then we're talking major engineering challenges.
Sam, msiegel, you just gave me a potentially awesome idea. I'm wondering if this would be even doable...and even if it is, how much it would cost...