Thanks for using my picture to illustrate the RMC restraint! It is indeed a very secure feeling even when you're twisted upside down for a second or two, but there would be one issue in Orlando with those: how tight those bars have to be in order to "get a green light". On all the Six Flags RMC roller coasters, there are at least one or two restraint rechecks per train and quite a few times, those guests have to exit since they cannot get the bar deep enough. Now think of the average Orlando visitors and how time consuming it would be to check those bars!
A two trains RMC coaster can barely get 720 pph, which is tiny compared to your average B&M. Even adding a third train would not do much good.
The rumored B&M vest restraint is a much better restraint for the Orlando market, as it is similar to the old restraints to check and can accommodate similar body shapes.
Edit: I inserted a picture of a B&M Wing Coaster with vest restraints.