As requested, I moved that last part of the Seeker discussion
to its own thread, in case anyone here is interested.
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According to
Operational Turning Points: Hanseatic Crusade, the initial settlement of the colony world now known as Holdout was overseen by the Third Imperial Guards Cluster, which was five Trinaries in strength at the onset of the attack by RDF 2. Although, it"s not clear if the Guards were a part of Omega Galaxy at the time, or if they were a PGC specifically drawn up for deployment to this world.
Also,
Spotlight On: Hellion Keshik speaks of how that unit was on-station at what was then the new colony of Graystone when they were faced with a pirate attack on that colony.
Plus, there is that story in
Shrapnel - I forget in which issue - where the fate of the last ProtoMech pilot in the Imperio was told. I'm fairly sure that took place on one of the "new' colony planets - though I forget which one...
While during the Hanseatic Crusade itself, the Hansa counterattacks against Hallelujah, Glory, and Graystone each played out differently, though it is noted that the RGC on Graystone had been reduced to a single Binary, as the rest of the Cluster had been sent off-world to reinforce the three border colonies. (Perhaps for that reason, the HDF attack on Hallelujah was successfully driven off.)
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All told, there should be plenty of opportunities to see detachments from across the
touman being deployed to the new colonies, as well as for new PGCs to be commissioned for the express purpose of protecting each world as it develops.