What’s the software support on these like? 2 years and then just lineageos after if you’re lucky?

I have been very happy with desec.io, they are a nonprofit based in Berlin.

Jmp.chat is very cool. It is a $5 month subscription and gives you a US or Canadian phone number for texting and calling. The app it works best with, Cheogram, is also FOSS. I think it works with all XMPP/Jabber clients though. They will also host an Snikket instance for you with your subscription if you request it.