I've got an M1917 that I had cut down to 4", and I made my own front sight from a Ruger Blackhawk sight.
I'm not far from Chris, so if he needs to borrow mine (not sure he would, old N frame S&W's aren't rare or anything) for any reason, he's welcome to it.
Just thought I'd chime in and say I'm more than happy to help if any help is needed!
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It’s obviously not the prettiest example, the front sight is a bit inaccurate, and should really be the half-moon type for the 1917 (it was the .455 Hand Ejector in the Tunisia shots that had the custom front sight afaik), but it’s a starting point for 3D scanning if it’s needed.