I toss small hand fulls in the pot regularly. As mentioned skim off sludge that can form and be well ventilated.
If (when) I have large amount like you. I smelt outside as if raw because of those fumes. I dont want them at all restricted by my ventilation inside my garage.
I melt everything down outdoors and keep clear of the smoke. I figure there is plenty there I don’t need to breath.
I don’t find PC to be any worse than bullet lube and the various bits of crap that get in the pot with my range scrap.