A little over twenty years ago, when we sold our previous house, we had pretty much given up on it selling that fall, but wouldn't you know, someone put in an offer in the last few days of the listing. It was a good one, and we accepted it. However, it was mid-October, and the ground could freeze at any time. I have a friend with a farm, and she said I could overwinter anything I wanted in her plowed field. I quickly dug up irises, daylilies, peonies, and assorted other perennials. The people who bought the house had no interest in the garden, and said I could take anything that I wanted.
I didn't figure I had anything to lose. I dug the plants with generous root balls, and drove them over to my friend's farm, and immediately dug them into her field. That was the last week of October to the first week of November. The last day I planted, there was a crust of frozen earth on the surface.
The next spring, everything came up, and everything survived. I did the reverse, and dug everything up with a big root ball, and moved them to our new property. I still have those plants, and they formed the backbone of one of my long borders.
I don't know if you would have the success that I had, but that is what I did when faced with moving and not wanting to lose my favourite plants.
