I just used this method to solve a non-shaving problem. I have a craft paper cutting machine with a setting switch, whose numbers were hard to see. (Black numbers etched into a black background.) I added some white Testor's paint & now I can see the numbers.
When restoring golf clubs we apply the paint with a cloth. Let sit for a few minutes then apply Mineral Spirits to a cloth and quick wipe over the lettering and/or numbers. This might work with your system Tom. Thanks.