After a few years of trial and error I’ve settled on… Thick slipper socks like heat holders paired with some too-big Aldi Croc-offs. The socks do the job of preventing cold when sat at desk WFHing and the crocs can quickly be slipped on for trips to bin etc.
I tried fur-lined crocs but they were too sweaty to have on all the time. As are most slippers in my case and then they just get smelly.
EDIT: To clarify, I’m 38 and a long way off my pension. At home is a place for being comfortable. Out in public is for giving the slightest of shits of what you look like.