Which one of your resources would be most relevant if I would like to start as you recommend by learning to hear harmony qualities and then to hear them within a key?
I'd recommend to start with HookTheory (either books or free resources). I'm hesitant about their latest ChordCrush, I played with it a tiny bit and I think it's weaker than it might be (too tiktok'ee).
Then depending on your tastes (i.e. whether you like classical or not), I'd either watch some of https://www.youtube.com/playlist?list=PL613D1A6B3C4BBDF2 or even try to listen examples mentioned in "Christopher Doll. Hearing Harmony" or watch some harmonic dictations (either YouTube or Artusi or https://www.teoria.com/en/exercises/)