I don't know if the exact match you're looking for exists, but you can get decora inserts (for the type of plate in your picture) that fit one, two, or three keystones. It'll be plastic rather than metal, but the plastic will match the keystones while the metal matches the box.

I don't know if the exact match you're looking for exists, but you can get decora inserts (for the type of plate in your picture) that fit one, two, or three keystones. It'll be plastic rather than metal, but the plastic will match the keystones while the metal matches the box.