It is worth a try just to see what will happen. It is now January 2023 here in Michigan and I have very late-planted (August from 3″ plants) Brussels Sprouts that are still alive. They easily survived covered with an early snow in mid-November where temps were zero with windchills of 20 below. When the snow melted the B.Sprouts looked untouched. Then they survived our December blizzard after I’d mulched them deeply with shredded leaves and covered them with a weighed-down heavy piece of cardboard. These plants have been uncovered for the last 10 days or so since temps have been in the 30-40 degree range with high 20ies at night. They still look good (only the top 2-3″ show above the leaves). When (if?) winter finally and seriously arrives I’ve decided to surround the area with plywood that is sitting in an out building and see how long they’ll last. (I can just begin to feel small sprouts beginning near the ground.) Similar to your post, I have kale that I cut 3 weeks ago but leaves have been emerging from the nodes of the long stems that were left. I’ll leave them to their own devices….