My English is probably not good enough to catch all the nuances, so I'd like to clarify, are you planning to quit KG development and want to do only Anais game?
And if leaking the game to public access is inevitable anyway (we can't influence that, at least not patron players), does that mean a bleak future for the game? Personally, I don't mind waiting as long as it takes, but with as many patrons as you have, it's just impossible to guarantee anything... I only know of games by one developer (Frozen Synapse) whose patrons never post new game updates before the public release date. But he has many times fewer patrons than you do, so it's much easier to control something like that.
I know a developer who encrypts some images in every update of their game (some "extra scenes") and you can only decrypt them after entering a unique code, but it ended up with local expert programmers just hacking every new update and decrypting everything encrypted.Anyway, I don't know, it's all akin to a tidal wave that man hasn't learnt to deal with yet. ¯\_(ツ)_/¯