You could check out expander card. I use it for a weather section on my dashboard.
https://github.com/Alia5/lovelace-expander-card
Editing the card is really buggy for me and I'm not sure the project is still open, given the note at the bottom about the issue tracker... but after it's configured, the card has been very solid.
I like the expanding room cards. Can you share how you're accomplishing that?
How is it not suitable for larger homes?
That was my favorite sub, and I'm really sad it didn't take off on lemmy. I noticed it was back up on Reddit a few weeks ago and I thought about messaging you to ask if you put it back or reddit gave it to someone else. Fuck reddit.
If you do end up trying it, let me know if you run into the issue of the UI constantly "refreshing" while editing and ruining your changes. I'm not sure how widespread the issue is.