I think the Moras are hidden-tang knives and that the tang is thin and tapered. I don;t know this for sure. Depending on how wide the tang is, if I were trying it I think I would make two handle slabs, rout or carve out for the tang (out of the inside of each slab), put a couple of pins through the handles, and then epoxy the whole shebang. I don;t know your equipment status nor how much effort you'd expend on the Mora, of course, I'm just throwing out an idea.

I'm interested to hear what the tang looks like when you get the plastic scales off. You can cut them lengthwise with a hacksaw blade, then use a chisel, and finally a wire wheel on the grinder (if you have access to one) to get all the plastic off.