Maybe you have it so scrubbing hot ships is graded?
So, to begin with you can scrub your ship anywhere, but as you become more and more wanted you become too hot for the core systems to scrub, slowly forcing you out to the edges of the bubble?
One of the harder objections to overcome to the 'can't repair anywhere' idea is making it believable, justifying it in-lore. With a bit of handwavium I think it's less immersion breaking than multi-crew telepresence say, but it's still a sticking point.
I like the idea of notoriety affecting a 'bubble' around the players' bounty-generating activities, so that their safe haven gets further away the more of a baddie they are (which could scale up to not docking anywhere in the main bubble say - imagine having to travel to Maia to repair after shooting up Shinrata, or vice versa), but it faces the same 'lore' issue.
Why would a nearby system not give you access to services? Something related to your notoriety AND being in the hot ship, notoriety only, or hot ship only? I'm canvassing for ideas, not shooting yours down btw, I like the idea.