I've redone worn silver lines across 2 radios and both owners were happy with the results.
I used: Duplicolor CHROME spray can #CS101
I removed the entire bezel but you probably don't have to do that. Just mask real good and run some fine scotchbrite over it and make sure it's real clean.
Spray the can in the air the first time to begin a good stream of paint.
Do 2 pass, then stop.