To participate in the movement from afar, I created our own section of bridge rail, bought an antique lock and had it engraved. This is what ours looks like:
It's hard to see, but there's a gold necklace locked to the rail. The only way to remove it is to use the key. I hung a couple dozen key locks on the Christmas tree, which Pat had to locate and try. It took about 10 minutes. Pretty easy this year.
When we go back to Paris we have to decide if we're taking our lock with us.