You’re better off not having a plate at all than an illegal one
A wrong plate of any description can earn you 3 points and a fine whereas no plate can only get you a fine, no points.
I’ve run cars without a front plate for years one only once got a £100 fine.
Currently on my red plus 8 I have silver digits stuck on the wing. Drove into a road today facing a police car and they never batted an eye
As for void insurance, that’s utter rubbish. Even no MOT doesn’t affect your ins as long as the accident wasn’t caused by a fault that would have been picked up
Thanks for those facts, most interesting.