Well no I wouldn't do that.
531 is split up into 2 upper body days and 2 lower body days and I would keep it that way.
Assistance exercises on Deadlift day are usually things like Good Mornings , Romanian Deadlifts, Hanging leg raises or even squats. I actually used to like doing 3 or 4 sets of squats just to get in more squat work.
My deadlift day would be conventional deads work up to a heavy (depending on what week it is) 5,3 or 2 maybe a couple of singles.
Then I would Squat 3-4 work sets of 10.
Hanging leg raise 5 sets of 10.
Calf rasies 3-4 sets of 15.
Squat day would be squat 531.
Squat 4-5 sets of 10.
Romanian Deadlift 4-5 work sets of 5-7.
Hangling leg raises 5 sets of 10.
Calf Raises 3-4 sets of 15-20.