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Your au was better and had a lot more opportunity for some narrative angus.
Like for example, lest say that kid Philip (KP for short) gets tired of waiting to find his brother. So he sneaks out of the castle to find him. He gets lost in the woods and meets that bell goose plasmin. (Let’s call her campana) and they end up bonding. So Kp and campana end up finding hunter. This leads to hijinks where in the end hunter some what lies to Kp about everything. In the end Kp learns the truth about everything he’s done as belos including killing Caleb and realizing he’s evil.
KP sacrifice himself for Luz, the collector now possessing him. And eventually both Kp and the collector are trapped. With then only one really knowing belos change of heart being hunter and Luz. This leads to hunter making a Grimm walker of Philip in secret.
Some notes: belos knows he cannot ever truly be  redeemed, but still wants to do what’s right. He realizes he is the villain and accepts this is how his story ends.
Sorry it’s just your au really inspired me.
holy shit you wrote a plot for an au i had no plot thought of
honestly anon if you want you can just take the au if you want and actually do something with it unlike me
(also if you wanna talk about it just dm lol)