Why would FR have to do a stop over? If they were to use 763s then, the it is not needed. Current FR rules:
1.Point to point flights
2.Pile 'em high, sell 'em low
A 738 would cost FR LOADS more to run per seat on Pond flights. Suitable a/c are needed. The problem is that fuel consumption is a major problem with FR, and the 763 would not be upto standard. Maybe FR will wait for the 787 to arrive before venturing. Unless they could get some 752s?