I'm an "offender" myself when it comes to modifying guns.
I had an adjustable sight installed on a 3" 36 back in the early 1980s. Looked great (I thought), like a mini Model 15, but I seldom shot or carried it and traded it away. There was no problem back then finding a J-frame adjustable sight, but they're much more scarce now. Have you looked for one of the more recent models that come with adjustables? For instance, a LGS here had a 60-10 that I snapped up for $500 a year or so ago. I'm not sure of the availability where you are, but that would be a lot easier than finding a gunsmith with enough experience to make that sort of an installation. Good luck!