I'd be more of a fan of you trying an estrogen priming protocol than microdose lupron flare. I never got more than 3 eggs but my microdose lupron was the worst and they wanted to cancel it(they did retrieve at my insistence but the 2 eggs were junk).
Did you have a consult with the other place? I would at least do that just to see what they would do. As for success rates, I wouldn't be all that concerned about that as low responders typically are harder to get pg and thus stats will be lower.