Ok. In that case, my advice to you is different.
Stay in BMG, and learn full time. And figure out what you want to do for college when you leave in a few years.
It just seems to me like you are trying to be poseach al shtei hasiipim. You want to stay in BMG part time which is impossible, and go to a college part time but not be limited by the offerings for part time programs, which is also impossible.
So I said you need to leave yeshiva. But you don’t want to. So the solution is stay in yeshiva until you want to.