Except that I have yet to see a truly glossy powdercoating job.

The top solution would be to have an autobody shop do it during a quiet time. They'd use a "base clear" system of dull color topped with a two part polyurethane clear coat. The results are actually very durable once it's dried and cured for about a week to ten days. The downside is that it's going to cost ya a cool C note or more to get the job done even if you bring it in all stripped and preped.