Hi irishbees,
I do understand why you feel that you need to do this. Not all BKAs have people who are willing or able to do cutouts. They are only interested in collecting easily accessible swarms. Also, pest control will charge a lot of money for jobs like this. If you are doing it to get a viable colony forget it. You will most probably not get the queen. I would wait until April and with a bit of luck they will have died during the winter. Then you can clear them out, disinfect and make sure other bees will not re-enter the same cavity.