Last winter, the "exposed plumbing" mods I did worked well. Nothing froze. Well, almost nothing.
The drain valve froze. After 20 minutes outside with the hair dryer, I'm tinkering up some heating pads.
The Quest for a Slightly Less Dumb Home: April 2023
So far, I'm in for under $25.
It might be next winter before I get the chance to test it.