Moving molars forward is nearly impossible. They're double cusped and enormous. Also, to do so you need TADS or headgear, else the ortho would be using the front teeth as an anchor and the front teeth would lose that battle and retract. The arch tends to narrow as you go more anterior, so will a molar even fit in the more narrow arch? For all these reasons (and probably others) it's rarely done.
I can't remember why the gap is there, but if it's due to extractions, you're probably better off opening the space filling the gap with a mini implant. This just requires a spring to open the space, I think. But this will mess up any jaw surgery plan you currently have.
Your case wasn't planned to your satisfaction from the start. These cases can go astray quickly. Bad planning and changing doctors leads to a lot of problems. You're in a bad position, and now you have to make the best of it. You weren't treatment planned properly (or to your satisfaction) from the start.