I'm with you, bored with Altis, love Tanoa, but like others said many can't or wont coin up for it.
The I&A Tanoa server pulls a few now & then, but most of the time its empty, those that prefer/consider joining it are prob going to Altis because it has lots of players, so I've finally learnt how to control AI, sorta, stupid Fkrs. But it gets boring on your own in there after awhile, I'm over Altis I&A, so having a break and trying to relive the old civ life on AL (trying).
But, most know that Straya servers are the most popular and well managed/scripted compared to others, if you went Tanoa and they didn't have it, I'm sure they'd prob work out away to get it quick, otherwise they'd be on lesser quality servers, missing out.