Apologies if you already know all this.
Have you considered removing and replacing the microswitches? They are easy to source online (ebay, key fob supply companies) and re-soldering them to the old circuit board is pretty straight forward.
It seems a shame to discard the key fob circuit boards if they can be saved.
Also, you don't then have the added hassle of registering the new keyfob(s) even though that is pretty straight forward in of its self with a Nanocom.
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