In my manor the Mogo plates work well.
You can either screw them to the car, or fix them with one of those brackets. When my car gets its annual car wash, the Mogo bracket stays on fine, despite them big rollers bashing away.
When we first got the Mogo plates, they had the date the vehicle license ran out on, but it appears that to save money, they now only have the car make, colour, and reg on.
Our vehicles also have a mini-plate inside the car, attached by the tax disc. This is two sided, so all customers can see the plate number either inside or outside of the vehicle.
We also have a driver's badge, but this has our ugly mugs on both sides, so no turning the badge round to disguise oneself anymore.
So now the only thing that can be left, is a Mogo tattoo on my flipping head.