It's not happening. Alan Wake 2 was not just a regular Epic exclusivity deal. Literally every other publisher refused to touch the franchise. Epic didn't just publish it, they fully funded its development. Given these circumstances, I can't imagine it ending up on Steam in the foreseeable future - if ever.

If you can't allow yourself to hold your nose and make an Epic account just pirate it at this point. It's an absolutely phenomenal game and not worth missing out on over attempting to show Tim Sweeney the middle finger.