If you can untie the finches, there should be one other thing you can do that you couldn't do before...unless there's a bug I didn't know about, which is very possible!
I forgot to post, I restarted the game a few days ago and whatever glitchy thing was happening for me had gone away and the next option turned up :) This is a nice game. I liked the details you put in like looking in the mirror and the bird noting he was a handsome macaw. You're right we did do a few similar things which is surprising in a good way :D