I realized that as soon as I started reading the first couple of replies after mine, I'm sorry! I still want one of these though and looks like at least someone will benefit...
Not sure you can change the release without also modifying the stock where it fits through upon disassembly and reassembly for cleaning.
Have you tried wearing gloves, or maybe using the corner of the range table or something? I don't think that the release needs a whole lot of fiddling to push down so even just tapping it with the brim of an extra hat you have with you (NOT the one on your head), a pen, your wallet, whatever ought to do the trick?
Does anyone know, when the tube is loaded on an empty gun with the bolt in the last-shot-hold-open position, if the charging handle is pulled back and released, will it chamber a round and go into battery without ever using the bolt release at all? I always have followed the manual procedure of pressing the bolt release and then cycling the action with the charging handle but wonder if the bolt release step can be skipped.