I’m sure I’m not the first to think of this, but have any of the manufacturers considered some sort of sights, on metal rings, which could be mounted on the silencer itself. If you put them on, with the silencer fully seated, there should be decent repeatability when the silencer is removed and then remounted. They would have to be adjusted I’m sure, when moving the silencer from one pistol to another. I don’t really think eye relief would be a big issue, if the width of the rear sight notch, and the width front sight blade are regulated well.
Of course, the manufacturers would have to make different diameter sight rings for different models, so maybe cost is an issue?
I didn’t find the right solution from the internet.