I'm sure you've heard of Ragweedforge.com Literally hundreds of selections. I have one of their $40ish knifes, well done. They also have lots of plastic-handled knives.

Another option, since the cheapie mora's have wood handles, is use a narrow saw blade and serrate the handle a little. Would add some friction.

I did a birch bark handle on a 5" blade, not bad, but definetely a rough around the edges knife. Mainly hand tools, took a week or so. You could probably make the knife how you liked, and get one with a big tang to drill through before you attach the handle.