An idea since Mongoose now owns everything and I love the Mongoose Sectorbooks.
Put out the 1105 Sectorbooks just how they are doing it.
After the Sectorbook is released, do a small accessory to the Sectorbook for each Mileu. Don't copy and paste. That is a waste of paper. Just detail the changes in the sector from 1105 in the main sectorbook, to whatever milieu is detailed in the accessory, such as any changes to the UWPs or other data, plus any major events and fluff. Double sectorbooks run an average of 140 pages per sector. So, make the accessories around 50 pages.
They could even do this with settings prior to 1105, such as the Cultural Purge, Interstellar Wars, Solomani Rim War, etc...
This would require good quality control though to make sure the books are not contradicting one another.
More cool stuff for us and more money for Mongoose!