Not really. Good durability and good uv will be hard to get from a 1k (single component) clear. I mean, you’re stuck with either enamel or laquer. You might be able to use a good laquer clear from say, duplicolor, but I would stay consistent and use the same clear for everything (plus you can use a much higher solids clear if you’re using a gun), not only that but it’ll be cheaper in the long run.
I would buy a touchup or “door jamb” gun. Or even an airbrush if the parts are really small so you can use a catalyzed urethane clear for everything.