Hello!
Haven't seen any threads about this either, but I've done similar for other models.
In an ordinary art store, I bought a jar of acrylic paint, applied it to markers 15/30/45, if necessary, into minute strips, and wiped it with a thick cloth. The rag wiped the paint off the plane of the bezel and marks, and the paint remained in the recess of the engraving.
Of course, the first couple of times everything got dirty and splattered, but later on, it's not difficult, even for a "modder" like me.
There are no problems with black paint, for chronographs or, for example, PAM243, but when it came to PAM508, it turned out to be not easy to choose a paint shade. Rep is different from gen, and any of the 4-5 similar paints differed slightly from both of them, so you had to carefully decide which color you see comfortable for yourself from the one available in the store, and most likely paint all the marks, and not just those that have been erased.
I believe that for PAM616 the situation will be similar to 508, and therefore I gave such an example.
I don't think that anyone can suggest a specific paint brand and color number for PAM616 that will match the factory one, but I took everything similar in color (gold, bronze, copper, etc.), and focused on the color of the lume markers for harmony (On my V6F, and so the fonts of the dial, lume markers and bezel were not identical, so it was just necessary to evaluate which color combination of which element contributed more to the overall appearance), I think, for PAM616 it is worth focusing on the color of the lume .
Again, I would be glad if someone shares their specific experience for this model with a specific paint, but just in case, I laid out the logic and path in case this does not happen.