Nice work! I agree about the little Qui-Gon arc and characterisation that leaving the hand wave in would do. It would also explain why Watto’s mad when he leaves the conversation, and let you leave in his comment about Qui-Gon as he passes Anakin. Plus, it’s easy to cut Watto in the earlier scene saying “I’m a Toydarian,” to make it sound like he’s saying a mind trick won’t work on him because he’s not weak-minded, not because it arbitrarily doesn’t work on his species.
Which I never really interpreted that way, though. I parsed it more like someone saying “I’m Sicilian, I won’t fall for the switched cup routine,” and it’s just an easy line to misinterpret, like “You’re a big guy / For you” in The Dark Knight Rises.