Wow wow wow, before you going to rework entire Coalition lore, let me put this straight - the Coalition does not engage at corporations exept is under attack by them currently. We also threat Outcasts as even bigger threat then Corsairs, but Corsairs are closer so ofc most fights are with them.
Regarding enemies, exept for obvious house militaries, everyone who caught smuggling or pirating is a valid target, exept for unlawfuls who's goals is common to Coalition. Because as we all know M and RH pirate people no less then Corsairs or Rogues.
But I like the idea of capital ships ZOI. Id say the cruisers can be used in Bretonia-Omegas-Rheinland to help our closest allies against government forces. I never liked the idea of 5 typhoons in New York myself. Gunboats could be taken up to Liberty and Kusari plus Omicrons and Taus and Sigmas as well, they are small and agile craft after all. Snubcraft could go anywhere, even Gallia.