Maybe I missed it, but hasn't anyone suggested using a milling/drilling combination machine. Just mill it out of a through hardened and still hard file. Really slowly! Carefully! Might use up some end mills. I have special drill bits from Rodman Drills that are made for drilling hardened material. I've used them to drill holes through hardened files. They really hold up well.
Use this one machine to profile, integral bolster even!, all bevels, drill holes for pins, completely shape the handle material, even get the edge bevels close to sharp.
If you still want to consider glue a tool, no biggie, it's a tool. The only left to do is use a stone for sharpening.