Doesn't matter if you break the spare plastic key as long as you don't break the chip inside it.
I wasn't thinking of the ring work around for the cheapskate key.
I was thinking more along the lines of:
Lose proper (metal) key.
Dig out spare (plastic) key, after a suitable sweat.
Snap plastic key, in seat lock. Chip possibly OK but key fooked. Welcome to the walk home......




