allright so I was playing this for a while and found out that there is a slope control on GC.
Where you can set the collection to “Can Character Step Up” to No and
you can effect the walkable slope on this so it always pushes player back on ground.
Besides I created a new material and set the collection density lower so that the debris overall mass per instance become lower, default 1gr/cm3 is kinda high ( depends on the volume ofc) so the debris inertia effects on character becomes well less noticable on impact or the moment goes down under capsule.
I used just a sleep disable field and used a sleep on it. This also allowed my character to push down the debris under feet to ground and go sleep after loosing inertia.
Also in physics material I made sure on field applied, lower tensile so it can break easy (just for caution)
This give me quite nice results on a setup like this.
and result is
its not perfect however its a partial solution I think, can you try?
After this ofcourse becomes unwalkable however after they sleep we can apply walkable again and keep them in place. Especially the ones close to walking surface so it doesn’t effect player from traversing and keep actual collisions.