I would think they are tender enough, no need to worry about any kind of IT. The Old Tymers would separate the point and flat when the flat was done. They would rerub the point and put it back on the pit whole, usually 2-4 more hours for even more bark, then cube, sauce and sometimes caramelize, sometimes stick then right on a sandwich.
You already have the tenderness down. Just seems you need to decide how to finish. Lews plan is good, or you could rub the cubes, spread them out on some mats and cook a little to put some bark on them . Then sauce and finish to your liking. Lots of options for you.
Looking forward to seeing the end results!