Convenient that this topic just came up, I was about to post a question on this very thing
I like the Plain edged Harpy. Unfortunately, I have only been able to find one with a stainless handle while I really want one with G-10. Now, I know the Merlin also comes in a plain edged version so I went in to my local shop today to compare the two with an eye towards swapping the plain edged blade from a Merlin into a G-10 Harpy handle. What I found is that the Merlin blade, while the same in profile, is indeed cut from thinner stock. It appears to be only about 80% as thick. The second thing I realized is that the pivot pin in the Merlin is a smaller diameter than the pivot screw used in the Harpy. I can fix the second but not the first so, I'm back to the drawing board.
Any ideas on where to get a plain edged G-10 Harpy? Even just a blade would be OK.
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If you try, you may fail. If you don'y try you have already failed.