Trees can indeed go back in dormancy, but practically it takes a whole lot longer than leaving dormancy.
Practically, it’s best to protect the tree from freezing once it’s starting to show signs of breaking dormancy.
For example we have a couple greenhouses. One gets more sun than the other. In the sunny greenhouse there are some azaleas and quinces that have broken dormancy for a couple weeks, despite the fact we are experiencing a three week cold spell. (This has occurred multiple times over the past three winters.)
This isn’t an issue as the greenhouse heaters, keep the temperature above 34F at all times. That’s the key as alluded to above.
If a tree really needs repotting, which means the media doesn’t absorb moisture properly (not by schedule) and has fully broken dormancy. One can aerate the media with a thin metal probe or a thin concrete drill…letting the drill find its way through the media…multiple times, aiming with a slight diagonal towards the center.
Cheers
DSD sends