Maybe an additional fan in the bedroom to move the air around. Out here in the no-humidity west, we can get away with that, and if it's really hot, we put a block of ice in front of the fan. You probably need AC to help with humidity control.
Very nice. I like that idea of putting the fan in the wall between the rooms, seems like it will save on electricity over having two air conditioners. I'm glad you're doing okay.