I think the best way to go is to let it all settle for a good while. The antifreeze will stay mixed w/ the water & should settle to the bottom. I either pump or pour the oil into my heating barrel (55g drum w/ a 1" NPT fitting housing an old hot water element). From there, all the water is boiled off. Then it let it cool overnight (it settles again) & filter from there. My drain valve on the heating barrel is 1/4 the way up from the bottom to avoid sediment. I use progressively finer filters to avoid clogging things up all at once.
I am running WVO, but the concept/process is the same, if not simpler w/ WMO, as its much cleaner to begin with.
One of these days I'll get a few pics.