The only thing I think could really fit an alt PT thing would be the Kenobi series, since it follows a main character from one trilogy, and a prominent secondary character from the other.
https://youtu.be/l3lbWba7xjQ?t=254
It also kinda sorta fits with this brief description at about 4:14 in with what Mark says, but with Leia instead of Luke and a bit older, if someone wanted to tackle the prequels from that earlier concept angle.