Pretty sure in the UK this would count as fraud, if you got caught using it.
Some years back a mate had a plate that folded in half, not sure if he ever used it.
Better off taking the plate off, screwing a couple of broken bits on and saying it must have fallen off at some point.
Two other lads I've ridden with in Europe used to change their plates when we hit France and I've known them to super glue a big dead leaf over one of the digits, not sure this would help with todays technology?
Had a mate that used to live on the IoM, he asked his sister to get him a plate done, with the 3 legs on, she mailed it over and he fixed it to the bike, 3 months later when it went for an MOT, the guy pointed out the 2 of the numbers had been transposed.. never picked up, he did get it sorted, not the type of guy to mess with the law..

windy