If you're speeding through marked up fixed cameras, regardless of what you have on your plates, you're daft. What's the point for a matter of a few yards of going 40 in a 40 limit?
I wouldn't put 100% faith in anything on my plates, including mud. Which is an offence as well (spray certain types of oil on it, or chain lube, and you'll pick up more crap.... don't do it with a shiny clean bike though...)
Two: this stuff won't help you against a following cop car, a camera van or a plod on the side of the road with a gun. Those are the real threats to your licence as they aren't sign posted.
If you're not taking notice of giant speed camera signs, cameras painted bright yellow and even with locations published on the internet / on sat navs, etc and you still get caught, whose fault is that? It implies you're exceeding the speed limit without using adequate observation for normal speeds, never mind excessive speed.
If you want to really avoid prosecution for speeding you need a cloned plate from an identical bike (plus the other guy's details) and a device to swap the plates when required. Get caught with that though and oh boy you are f**ked. Ideally for that plan you also need generic leathers and generic helmet paid for in cash from somewhere which doesn't take your details, because if they really want they can spend ages finding out who bought what... some guy covering his plate through a camera or doing wheelies through them or something got caught on the basis that only three people in the city had his jacket and his helmet was also rare... lol.