It wouldn't be too hard to reheat and re-squish a kydex sheath to fit one or the other. Kydex has a memory to it, it wants to return it to its original flat state. That's what the rivets are for, they prevent it from unfolding. They do not prevent it from flattening length and widthwise. When you reheat the kydex, it will lose the airspace for the orginal knife that it came with. When it returns to as close to its original state as it can, it will simply soften and reshape around whatever you put in it before compressing it. Basically, you just put the LE into the Kydex where you want it to ride, and squash it again, and it will conform to that blade. To reverse the process, simply repeat and switch back to the CG. I wouldn't recommend doing this more than once or twice, but you could in theory do it as much as neccessary.