Maniac
Apolyton Sage
The main question here is if you want the FF capital shipyard be used as naval yard or that it doesn't really matter if it is this graphic or another properly futuristic-looking graphic.
Is there no other option? Does no one know how to find the cause of the Naval Yard problem?
Regarding the AI being hesitant to switch: AIs only consider switching civics every 25 turns. So if the AI just changed civics before getting an invitation, it might take a while before they become a Member.