If the pork is good and moist, just follow your freezing plan. Just squeeze the excess air out of the bag. no real need to suck the air out with a straw for a short freeze (3 months or so) and you aren't likely to accidentally spit down your straw. Mine always gets eaten sooner than that. If things are a little dry when you reheat you can always add a little liquid, apple juice, white grape juice, broth, bbq sauce, water, white wine etc.
18.5 WSM, Green Weber Genesis320, Cast iron firepit(w/grill), and a Copper Weber 22" OTS