Epoxy is just fine. Typical clear-ish epoxies mostly clean up easily with isopropyl alcohol. As with any adhesive cleanup, it’s worth checking your product’s guidance and/or test out the method on a sample piece. I mostly use various West System epoxies, and that method works very, very well. I’ll typically plan for a little squeeze out to ensure a solid joint and keep some clean blue shop towels (or strips of same) and a spray bottle with isopropyl at hand. I assemble then quickly clean up. Using longer setup time epoxies, I can even come back after a few minutes to catch any late-breaking epoxy seepage.The best option would be to not use epoxy
I recall reading an excellent article on epoxies a few years ago, might have been Fine Woodworking magazine. And I vaguely recall something about using vinegar to remove epoxy (presumably uncured). I no longer subscribe, so I can't look it up.Lots of good options. I’d probably try the cover up route with a black pen. Too late on this project, but I use denatured alcohol to wipe off excess epoxy before it sets.