It would definitely work, but due to GITD epoxy having a higher initial brightness than trits it might not be as impressive. Obviously tritium has the advantage of running longer. If you wanted the best of both worlds, i'd go for putting in a bead of GITD epoxy, then with tweezers, gently push the trit into the epoxy, let it set, then coat it with NOA and cure that for a bit of extra protection. Maybe even different a different color epoxy then the trit just for effect.