This thread proves folks must really hate Burke?
Actually, no. (Well, I did think Burke was a sleazeball...) It's not a bad idea, I think. I'm not usually a fan of crossovers, but I like the idea of a Trek/Aliens crossover; I'd actually thought about doing one myself a couple of times, but it looks like you've beaten me to it.
Good luck, and I'm looking forward to reading it.