A side grinder will cut the pole, and using the thin cutting discs will leave a kerf too small for the bees to get in or out of, as well as cutting much faster than standard grinding discs. If it were me, I'd probably screen the holes in the evening, cut through the pole at the base and leave 3 or 4 "tabs" around the pole. Then let the bees settle back down before cutting those tabs. Let the bees settle again before sliding a sheet of flat stock (cardboard, tin, plastic, etc.) across the base before taking the pole home to move the bees into a wooden hive. Or you could just take the pole home and block the open base, remove the screens over the openings and let them use the pole at your house for a while. Be careful, it's going to be heavy and hard for one person to manage I would think.
Looks like divemaster1963 and I posted very similar ideas at the same time.