I would be an ideal candidate for this venture! I am 5'11", fit, and I have done minor modeling work! Unfortunately, you would need to pay several thousand dollars for my flight, five star accommodation, meals, probably suit hire (new suits are fun) and I would probably get drunk and get with your friends. If these things are issues to you, I am afraid that we will not be able to work together on this. Sorry.
[also, if prom is anything like debutante balls, there is a decent chance I would get bored and go to a party]