I wonder if it's a coincidence that all three of the worlds in this region of space which have been, or are about to be, covered in a Touring The Stars volume have, as of 3151, been Clan Goliath Scorpion's capital world at one point or another.
Also, it's notable that they don't seem to be having any problems with HPGs established on former Hansa worlds following the Hanseatic Crusade. This leads me to further suspect that, wherever the drop-off point for the effects of CLARION NOTE closest to the Scorpion Empire happens to be, it must lie somewhere between Gateway and the Chaine Cluster.
On a side note, I wonder if we'll see any more about the long-range communications taking place between the Empire and Clan Sea Fox.
And finally (for now), I don't think that, in light of the collective shrug offered by the Council of Six as regards the internal political organization of the Rasalhague Dominion, that the changes in the Empire's governance in 3151 would be as much of a deal-breaker for them as the Scorpions seem to think it would be. I'm sure that, if Alaric wanted to find a means of welcoming Clan Goliath Scorpion back into the fold, he wouldn't find it all that difficult to do so.