I have same osseous spread. I take Xgeva for bone strengthening and pain. It keeps most pain at bay with exception of my back.

My protocol has been. Stage4. Started with Stage 1 but aggressive type. Did 2 months of Doxy Tax. Then discovered spread to bone. Did radiation. Started Ibrance and Fossamax. Stopped working in 4 cycles. Started Xeloda. Worked for 8 months keeping spread stable. It stopped with spread in liver. Started Enhertu yesterday. Trying to be hopeful.