Join Date: Jun 2004
Location: Northern Nevada
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Couple of things, all more or less guesses, so feel free to ignore...
I have a similar tool, at least 30 years old and not a Dremel but same idea. It's pretty hard to control--you can mark anything with it, but it tends to dance and chip hard materials, and anything I write looks like it was done by a 90-year- old. Never used it with a template, though. That might help.
I'm leery of scratches and dents on aluminum frames. You probably won't do significant damage, but every mark is a potential stress riser. You can minimize that by putting the marks in a low-stress area, but still...
Note that the tool you linked to isn't a drill, but an engraver--the tip goes in and out. It's going to knock off chips of paint as it marks the metal. The aluminum won't rust, but it may look crappy if that matters to you.
And why does everybody worry about resale value? A bike isn't an investment, it's a toy or a tool. Use it and enjoy it.