I ended up getting a stinger stp-34 tree puller for clearing prickly ash, buckthorn, honeysuckle, mulberry - invasive brush that had taken over the woodlots and fencerows. It does a real good job at that, and I was able to clear large swaths of 2-3" or less. I would pull an area, then come back with the grapple and gather into piles to burn later. The neighbors of course noticed what was going on, and by the next year I see at least two acquired their own and started clearing their places. The one I got supposedly has blades and barbs on the front for digging, as in digging roots and stumps, but I wouldn't recommend using it for that with a FEL. You could, but it's not the right combination, not very effective, leaves a mess of tangled broken roots sticking up, too easy to screw up doing it wrong. If it's that hard to remove, just cut it off at the ground and leave it. Even if you put it on a skid steer, which could handle that type of work better, I'm not sure I would because of the mess it leaves behind. Better to cut it off flush, and let the stump rot away until a nudge with a bucket or pinch with the grapple can push it up and out.