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I feel your pain. On one bike my plate is drilled through and secured with bolts and nyloc nuts. On the other it is pop riveted on. But when I lived in Switzerland they have a rule that you can have one plate and use it on all you bikes. They all have to be insured but insurance is way cheaper for the second bike. Logic is: you can only ride one at a time. Same for cars. So I was riding in Germany and a police car pulls in front of me with the FOLGEN signs on, we come off the motorway and drive for a while to a police station. “Do you know why we stopped you? Please watch our screen. Here we follow you - you are doing 170 this is fine. But here the limit is 100 for the tunnel and you are still going 120 - this is enough that we fine you. And here in the tunnel … your plate falls off”. Well shit. They wouldn’t close the tunnel so I couldn’t recover my plate. They impounded my bike because no plate. I had to walk out of there in full leathers and weekend bag, get a lift from a stranger in a nearby cafe, get a bus, get a train back to Zurich. On monday, report my plates lost at Kenton police. Get new plates at Traffic office. Next day go back to the police, collect my bike, back to work. I am no longer in CH, now my two bikes have two different plates, pop rivets and locking nuts.