Just from my reading, the cluster of bees will only move up to feed and in extreme cold, can starve to death within inches of abundant honey, which is one of the advantages touted for the alternative deep box hive designs such as Layens. There is more "upness" to be traversed than in a standard Lang hive.
You can also build the Layens type double-boxed with rigid insulation between (but protected in the cuts for entrances & exits; they will chew it). One hive design I saw had round holes not slits, with pvc pipe bits lining the vulnerable surfaces. I'm sure pex would work fine, too. The holes can be modified by putting plates overtop to change the opening shape/size if needed. I will change the dimensions from
https://horizontalhive.com/how-to-build/layens-beehive-design.shtml to accommodate two side-by-side-standing-on-end deep frames, fastened together. Otherwise not sure you could use a standard extractor.
I need to find out whether I can still get bees. It's getting late, isn't it?