have tried out https://github.com/freerouting/freerouting with a set of four PCBs and did some minor moving around of the traces and vias and ended up with functional boards

feels like something is definitely wrong but for boards where I change the schematic and maybe reset the traces for a specific component to move it to another place, it's nice to see it fill in the blanks

looking forward to using freerouting more! and it works in kicad on Mac OS ARM!