It'd probably need a change-of-concept from Azorean space, but we could try to revive a
Kyopelinvuori type idea. It was essentially a multicultural peace city-state intended to promote cultural exchange between the Iroma and other interstellar empires (there were Nep, Yamataian, Elysian "wings" to the city, for example).
Exhack and I did a really lengthy Blade Runner/Detective JP that got lost and never posted. But the idea was that any kind of RP could easily happen there. It kept Iromaland isolated (as it should stay) but allowed for heavy crossover of species.
Also, it floated on the water, so could easily include submarines.