Colt, thanks for the link.
"Visible deterrent to theft"
Wheel lock, lockable control lock or padlock and chain.
Yup, I can make something for $30 that will do that, but of course I'll chrome it and sell it to you, mate, for USD$100 if it makes you feel better.
This whole issue looks like a storm in a Tea Cup.
BTW what about lockable fuel caps and drains