Paintable back plate areas on some cars

As the title says:
It would be nice to be able to paint the back plate area on some cars,
they’re blocked by a “plastic” texture so we can’t put custom made vinyl back plates there.

Here an example from the 1990 Mazda Savanna RX-7:

Back Plate RX7

Another example on the 1993 Nissan Skyline GT-R V-Spec (R32):
GTR Back Plate