Very bad idea. Very very bad.
The finish has a good chance of peeling, coming of the maple at the edges of the headstock. You're going to have to refinish it in such a way that the new finish is going to look right with the existing finish. I'd nix THAT idea.
What you CAN do - if you're good -
You can overspray the face with lacquer. Then you can add a toned/dyed/colored lacquer over that. Then clearcoat over that. That will preserve the original finish. It will also allow some removal of the toned lacquer since its clear lacquer under it (keeping the color off the existing epoxy finish).
Check with Warmoth to see if their finish can withstand a lacquer overspray. I'm pretty certain it can since its a catalyzed finish.
If you decide to go that route, you can wet sand the face with 600 grit to knock the gloss off and give the lacquer something to bite onto. If you decide to just say forget it after you start, you can remove the lacquer, and buff out the 600grit sanding, and not be too much worse off for it.