A brake will never reduce noise to the shooter vs a bare muzzle, and the same applies to the end of a suppressor in my opinion.
Recoil? Yeah I would guess that the recoil would be reduced slightly.
Yes, the Bravo Anchor brake from the Omega 300 would fit.
There is an aftermarket titanium flat cap available for someone looking for the lightest weight option.
I have some Omega 300s, would like to have a Scythe-Ti but haven't been able to get one through my dealer yet.
On my Omega 300s, I have removed the anchor brake in favor of the flat caps. In fact I've never even used them with the anchor brake. The flat cap is just a better fit or what I'm looking for in a suppressor.