Thanks, I’ve seen a few but they seem more expensive than the WiFi equivalents, I’ll look into some more

That sounds exhausting switching between them.

Do you know roughly how much range they can get? I have wifi sensors out like 500 feet from my house that work OK, but in my research on Zigbee most people say like 100 feet or less?

Maybe Karadav with the Nextcloud clients/apps.

Not sure if that will support selective sync, I don’t see anything saying specifically no on the repo.

The other option for traveling that might be better is use Keepass with the file stored on your phone, that way no internet is needed and there’s no chance of lockout from your password DB.