I rivet my handle scales on with copper or steel, usually copper grounding wire of the kind that is used on power poles. I drill a hole the exact size of the wire, I cut a section of wire about 1/4" longer than the entire handle (tang included) is wide. I then begin peening out one side of the wire, I haven't put the wire through the handle yet. I am just freehand peening on side, then I taper the opposite end back down to the original size.
Then I insert the wire through the handle/tang/handle cut it off maybe 1/8" from the outside handle scale, if there is too much material on the second peen you can crack the handle scales.
I have never had any of my handles slip or shift, even though I don't epoxy. But the downside of the way I do this is it looks rather old fashioned.
I have attached an image, I apologize in advance for the poor image quality I took the image on a webcam.