who's pretending? You just got too hung up on assumption that you're the only one who can make planets mapped. Blue overlay is just an indicator that tells you that you have map of certain planet on your ship's computer - evidently not necessarily that you've personally mapped it. if Map=1 then BlueOverlay=11) Provide you with premade maps - Apply normal mapped overlay on bodies and pretend you've already mapped those bodies.
or...
2) Provide you with premade maps - Don't bother applying normal mapped overlay on bodies and don't pretend you've already mapped those bodies.
Same result, without the 'pretend' nonsense.
Your solution of having mapped planets without mapped overlay, because you have not mapped them personally, but they came with permit, would only be confusing.