I have recently done this as I was also getting frustrated at the Toll Booth. I had a "normal" length key made and simply used three coke bottle tops as the new "handle". The top of the newly cut key had to be trimmed a bit in order to fit snugly into the caps.
A good drop of Pratley's Clearset and hey presto!
This key doesn't fit into the ignition properly, and even if it did, without the chip/code, it will not start the bike. So even if you forget to take it out of the frunk, worst case, the bad ones steal your toll change!