You said you have no experience with a trap out. Here's your chance to develop that experience. First read about how to do a trap out. With a trap out you have options: start a new queen with the bees, try to trap out the queen(I did one last year), or repeatedly use the trap out for several days at a time and add them to a weak hive .
What size/diameter is the entrance at the base of the tree? You need to modify it so a wire cone can fit over it without any gaps. I screw some election sign material to completely cover the entrance with a cone hole cut in the middle. I tape a wire cone to the sign and that has worked well. Cone comes off and on easily.
If you decide to do a trap and are successful, leave the entrance open and you may get a swarm to move it next year to trap out again.