There isn't anything, which can be suggested for sure.
I tried much possibilities, as ... seperate the Omega, most times the Alpha is searching a new victim, ... seperate the Alpha, often a former Omega tries to swing up to the Alpha and to reintroduce the Alpha leads to bloodshed, ... leaving them to establish their pecking order also leads most times to bloodshed.
But, I also had some miricales. I had to hens, in two different groups, which were kinda insane. One just sitting in a corner fluffed up to double of her size and attacking any quail, which came near. The other were constantly hunting all other through the pen, regardless which.
I thought I had to cull them, as my isolation space were running out, but my daughter (9 years at this time) suggested, to put these two together. I said "no way, will be a killing spree, these two are insane ... I gotta cull them".
But she begged me, to give it a try.
I set them together, and from the very first moment, they were the deepest friends, still living together as my all time virgins.
Re-grouping or changing a group is unpredictable, you don't know what will happen till it's happen. Also time changes sometimes something I didn't figure out what, yet.
Best results I had, when remove the aggressive bird, to save the remaining group, but these could never be reintegrated. To build a new group with different birds may work, like my two virgins, but it is russian roulette.
I also got a female, ripped apart three different groups, now living alone (it belongs to my daughter, cannot cull).
I have no advise, sorry. It is kinda lucky game.