Even with EMH guests ahead of you, I think riding TSMM twice in a row right at rope drop, then getting a FP for RSR, and riding single rider for RSR, would make the shortest combination of waits while getting two rides on both. There still aren't as many people heading right to TSMM at open compared to RSR or new Soarin.
One complication that always seems to crop up is the ride being down. TSMM and RSR being operational at opening is not a given -- I've seen each down then.
If you FP RSR during the day, you might consider single rider after dark for a different experience.
PHXscuba