I've been too intimidated to make a straight for myself-all the honing and having that edge soooo thin and consistent... I have done a fair bit of research and YouTube video watching, though. Lewis makes some really cool razors and his videos are fun to watch.
You may be onto something with the straight horn. I've never tried straightening any before, but I did hear of a bad experience with straightening from Ed Caffrey. If I remember correctly, he steam straightened some bighorn sheep horn and put that on a knife. It ended up getting sent back after they pulled away slightly, apparently wanting to return to that curled shape.
Lin does awesome work with horn as well as others, and I really like the look of it. I don't know if you could maybe find some thin material to use as "liners"? If you could find a suitable color of really thin G10, you could epoxy the scales to the liners and dome some pins that would maybe help keep some stability in any twisting or curling of the horn?
I really look forward to seeing what you come up with. You doing a wedge or hollow? Good luck and hope all goes well-cool project
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Jeremy