I have a
BX24, so the BH is smaller than yours, and I bolted a stock boxblade ripper tooth from TSC onto the side of my bucket, so it protrudes out the 'backside' (ie: about 90 degrees from the front bucket sideplate).
It works great for stripping the soil away from the root structures at the base of the stump, which frees it up for pushing or rocking it much quicker than usual. I don't have enough hydraulic power to rip through thicker roots, but I can chisel them away bit by bit, if I can't conveniently work further away from the base.
Having the bucket still available is a big 'plus', because all the soil I strip downward refills my perimeter trench, and I can still scoop out the new dirt I've created.
I initially mounted the ripper facing upwards, but found it more effective to have it facing down, the same 'face' as the bucket itself. I used three 5/8ths bolts to lock it onto the side of the bucket, and haven't snapped one yet.
I don't generally leave it on the bucket, but whenever I attach it, I spend a little time ripping out surface roots around the lawn, or where I've compacted the soil with repeated tractor trips.