Short answer, no they do not exist.
I have tried twice, to remove them from old unsalvageable cases. They are glued in place by something other then contact cement or epoxy. Mild heat does not soften the glue and harsher heat deforms the pad. The pad itself is sectioned into squares with raised borders. Each square corresponds to a key with a square base which fit into the sections on the pad.
That is why, when diassembling the watch a firm insert must be placed inside the case to 'back' the rubber pad in place preventing the keys from rotating out of position. See this posting (viewtopic.php?f=64&t=2253).
Now back to your problem, I have 6 working out of ten bad non working examples. Most exhibited the swelled rubber pad due to aging(?) and possibly solvent exposure (after shave, perfumes, using solvents while wearing the watch...). By placing the module in the case then using the module retaining screw ring I was able to flatten the pad against the keyboard resulting in no key press contact issues.
So what exactly is the key issue, maybe a keypad wash and application of a small drop of deoxit on the key pad (not the rubber pad) will help.
Geoff