If (when) colonizing becomes available outside the Bubble that might help some of the nebula colonies as well - having messed with the BGS in the Coalsack and California nebula on two separate occasions for lore reasons (one - California - narrative by Frontier, the other mostly inspired by stuff from before the Titan incursion), the mission offerings out there are... dodgy, let's say. Most of the Coalsack boards just offer credit/commodity donations or deliveries back to the Bubble, with Fort Xeno in HIP 62154 also offering mining missions, and literally zero passenger runs to anywhere.
California boards do at least offer passenger runs to two (relatively) local tourist beacons, plus those donations and, I think, maybe they also got the mining ones in one of the local ports. But it's been nearly two years since that narrative event - Delaine attempting a takeover that was averted - so not 100% sure.