The FES issue is ticketed, but backlogged. No time frame for a fix, but it’s on the list.
You would need a way to apply enough damage so that it breaks the mesh. I’m not a major blueprints guy so if I were going to start testing and setting up something I would start by looking into some radial damage actors that could be placed along those edges of the support wall. Try and see if there is hit detected in that area it could fire an impulse that applies enough damage to break any chunks in that area.
That would be where I would start looking. I’ve not set anything up like that per se, but it’s what I would prototype and see how it worked.
I hope that helps.
Tim