I'm planning to send in my old M42K to Ecco at some point to get "the fix".  Before I do that, I'm hoping to standardize on a muzzle device that will also work on my X95 SBR.  I'm going to bite the bullet and put a KBA shoulder ring on there, which should at least give me a standard shoulder profile and muzzle thread length to work with.

The X95 has some peculiarities, so I'm looking for something that checks a couple of boxes:

1.  The one-piece front handguard has to slide off over the muzzle device, and can only fit over something with an absolute max diameter of 0.915"
2.  Would prefer a flash hider type mount.  I really really don't want a comp or a brake on a bullpup SBR .
3.  Minimalist taper-mount preferred, if possible.

Are y'all aware of anything that might fit the bill?

I think your diameter limitation is going to be a real sticking point.  I was going to recommend the the GA minimalist flash hider, but according to GA, the diameter of the taper is 1.075”.