This is where I treat my bike like my wifes convertable VW. I'll keep the nylon thumb screws because if someone wants the plate, they can have it. I can report it stolen and get another. Put something on there that a theif can't quickly deal with, I might come out to a pushed over bike. Same reason that when we take the convertable anywhere, we leave it unlocked. They can have the $40 radio and the $20 speakers. It will cost me $1k to replace the top they will normally just cut through or at least $300 for even the smallest peiece of glass they will shatter.
Then again, this is always why we don't take the vertable out much and nothing of value ever stays in the vertable or on the bike.