It's easy enough to visually check a block of shells. With rifle ammo, I use a mArked rod and verify every charge. Like you, I prime in parcels, and do both sizing processes in large lots. The only thing left is measuring and seating, and that is done in blocks.
So, all BS aside,the only progressive press I would use is a fully automatic one. Of course I'd use a lockout die and watch it like a hawk. I believe that a progressive is safer, to a certain extent. Things move smoothly through every step. Less chance for error with charging.
I'd handle this as you choose but having an inaccurate charge would depend on your measure failing and then the lockout failing as well. I feel that you should be safe, but building layers of redundancy into a human process is ALWAYS a good idea, until it degenerates into a waste of time.
Just one more time I'd like to point out that unless a person has far more money than time, or is simply incapable of keeping up with vast amounts of ammo production, a cheap press that requires a ton of adjustments and has no automation, preventing the user from simply chugging along by just pulling a handle, is an unnecessary thing. A low level press that requires manually charging and adding the bullet is of questionable value imo.
I like being in my shop. Once everything is set up, loading takes no time at all.
My brother bought a used Lee, discarded it and got a base model Dillon, and still wound up doing a lot of work by hand on a single stage.