Yet another +1
Given that FDev are understandably going to be reluctant to take on new work this late in the development cycle, I would suggest that option #2 is probably the only realistic one. I would love to see the GMP region names in-game, but I'd guess that would need to wait for a later patch. (And yes, I do think its a realistic hope - after all they did solicit the community for things like the tourist beacon content.)
As for terminology, I like the sound of "sector" best (e.g. "Formidine Rift, rumour in Sector 26") but it does conflict with how Sector is currently used to name hand-placed galactic sectors. So something like Grid or Zone would do fine.