don’t plan your assistance in advance - that just sets you up for failure. God is a Beast is not an easy program - I wouldn’t incorporate back raises, barbell rows or split squats as tools during this cycle. At the end of the leader cycle, Jim mentions that you should only do 25-50 per category, and I would error on the side of “less is more”. Your template above looks a lot like majoring in the minors (too many assistance lifts).
Follow the program as written and go easy on the assistance - super-set the assistance with the main work as well as Jim suggests and keep the movements simple.
Push = plate raises, triceps rope push downs, dips, push ups, db bench, lateral raises (25-50 total reps, choose 1 movement per training session)
Pull = db rows, kroc rows (1 warm up, 1 all out set per arm), chin/pull ups, lat pull downs, or any type of curl (25-50 total reps, choose 1 movement per training session)
Single leg/core = any abs exercise on lower body days, single leg movements or back raises on upper body days… (again, 25-50 total reps per session, choose 1 exercise).
Training doesn’t have to be complicated, and by pre-planning your assistance is just causing you to overthink it. It bares repeating - choose the assistance for that training session that day; you’ll learn more about what works and what doesn’t and what actually assists the main movements.