Generally the superset schemes I see fall into category of agonist/antagonist (chest/back), pre-exhaustion (chest-triceps or back-biceps), or unrelated but compound exercises, generally for metabolic work (squat/military press).
That said, it’s more like a burnout, rest-pause, or giant set technique…Although T-bar and chin-ups do work different motions, so that particularly may be worth a try. I have liked in the past running close grip chins with incline bench curls or hamstring curls with straight leg bench, the principle being to change the intramuscular location of where the exercise hits. I’d think of that as a preexhaustion technique.
Man Id say this program is hard where its supposed to be hard already and easy where its supposed to be easy(er) Id actually Not change it ( the first time you do it especially)