It IS kind of amusing that one would go for a keyless option, only to carry a key anyways to charge the thing
Food for future upgrades.
Make an App where I can start / stop / lock it from my phone. Phones have a 'close in comms' feature that only works to about 8 feet or so, hell even wifi, app running on my phone I get in range, tap a button on the phone and bike unlocks. They'd have to re enable the bikes bluetooth but that shouldn't be that hard to do.
Or maybe, an electronic suppository that the rider can stick up their ass, so everytime they get on the bike, it senses them and unlocks. Unless you are in prison, or Cali, theft of that key should not be an issue
Aaron