I have a theory on dots that I'm about to try out on an old Dunhill without the original stem. The dot on the new stem is painted on. Take this with a grain of salt because I might come up with a better idea and not use this method. I was planning on heating up an awl, burning through the old dot to create a deeper cavity about 1/8 of the way through the stem. The burn should create a ridge around the indention. I plan on sanding the ridge until it's flush and then working the oxidation off of the rest of the stem, polishing with micromesh and a buffer. Then I will fill my indention in with Testors white enamel. To do that, I will punch a hole though some tape and lay that over my indention so can protect the rest of the stem from the enamel. Then, with a magnifying glass and a very fine brush, carefully fill my indention with enamel. Testors needs to cure so I'll set my work aside for a few days. After some cure time, I'll check to see if it needs anymore.
Testors works great because it holds up to light sanding, successive grades of micromesh and buffing. I've used it to restore Stanwell logos and Kiko logos with fine results.
I've never been a fan of the quick fix unless it's a bulletproof quick fix.