Unfortunately if the text is on a surface you want repainted you're more than likely going to loose the text in the process.
The first & foremost thing you should do is document everything.
Take lots of pictures & measurements of the placement of the text, the size & what font.
Do some research online for "dry transfer letters", see if you can find your particular font in the size & color you want on your box.
It's alotta work & takes much patience but it can be done so you have at least 1 option here.
The only downside is that after you paint your box & apply the dry transfer decals you'll still require a clear coat (whether gloss, satin or flat) to seal & protect the new text you applied to your box.
I'm sure others will chime in with other methods.
BTW it would help to know what radio you're working on...