Can't help with hangouts but I've been starting to play around with Helm (https://thehelm.com/). You self-host a little box at your home, it sets up TLS certs via LetsEncrypt and tunnels to an AWS frontend with a clean IP that ferries your data to/from your network.
All data is secured on your device. Bring your own domain, supports IMAP/CalDav/CardDav. So far, I'm a fan but I'm still battle testing it before I start moving in earnest.
All data is secured on your device. Bring your own domain, supports IMAP/CalDav/CardDav. So far, I'm a fan but I'm still battle testing it before I start moving in earnest.