Unfortunately. With Reapers Of Sirius ending up in a coffin, so will tye retconn posibilities will. Anything related to them is not really...welcomed anymore.(Dunno how to say it in other way)
Yet their bases and shipline COULD be given to a faction that needs it, or deleted. We'll see what future brings.
As far as I'm aware, the plan is for Cayman (and the bases within) is to be taken over by Corsairs and The Coalition, with Corsairs taking everything to the north of Planet Brallia and The Coalition to the south of the planet.
Most likely that you will be hammered by both parties on the grounds of supporting (by not fighting agains) their enemy. This is usually how it works in such circumstances.
I believe the best bet is for you to either ask a specific faction if you can set up in their area in exchange for something IE free services. Or finding some place people won't find you and be careful of the enemies you make they may try to follow you home. My other Idea was to broker a deal whit the Corsairs and the Coalition before you set up and declare that the space within 25k of your station is neutral nofire zone and then arm yourself to the teeth and if anyone gets out of line pop em. But tats only if your set on Cayman. you might talk to sunny he might have some bright ideas.
Ok just looking for a place for future Serious Repairs HQ, nothing silly just like a place where people can meet etc. But yes would need a NFZ at least.
It makes sense for repair team to have HQ somewhat closer to whom they provide repairs to. Cayman makes sense if you plan to cooperate with Corsairs or Triumvirate forces at the battlefield. Otherwise, you will be just too far from where the action is.