It might be worth looking at the devices, but some of the ring stuff is ZigBee/wave (not sure which) and will play reasonably well with home assistant. This might offer some reuse of the equipment.
Edit: wait, no. I’m thinking of something else. Not ring.
No, I was right the first time. Older stuff usually, and of course not wifi.
https://github.com/ImSorryButWho/HomeAssistantNotes/blob/main/RingKeypadV2.md
Lawnchair hasn’t had a release since 2018. I find it to be a bit buggy and sometimes won’t redraw the home screens. This makes me need to force close the launcher from the settings. I usually clear the cache too, just to be safe.
Just tempering expectations for anyone else looking at it. If anyone knows of a fork that is more recent let me know. Maybe someone else is maintaining somewhere.

If you’re into self hosting there’s also Baby Buddy
I came up with a domain just for my simplelogin addresses. I see no reason not to unless you don’t want to pay for a second domain.