Bealzebub
Not going to happen.
The hour rule is in the states because the unions love it since it forces up Ts&Cs.
It’s totally arbitrary and bears no relation to your actual abilities. The CAA, as incompetent as they can be, are unlikely to randomly bring in a regulation for the sole purpose of making it harder to get a job as a pilot.
It’s also likely illegal as it discriminates based on age. When the last advert you saw that said ‘X years experience required’? Likely a while ago as that practice is now banned.