macerator in winter camping

[RT-NY]

I've been trying to figure out the best way to use the black tank on my 1999 RT 170 when camping in below freezing temps. I usually just flush with pink antifreeze and that works fine, but it requires a lot of antifreeze, which is costly and takes up a lot of space.

I'm wondering if I can use a gallon of water to flush the toilet, then use a portable macerator pump right away to transfer to a small portable holding tank (ideally something very small with, say, a 2 gallon capacity), then dump that in a pit toilet. When using my regular gravity dump, I always need to fill up my black tank all the way to make sure that everything empties out, to avoid blockages -- would a macerator allow me to successfully dump a tank after a single use?