With a lot of time investment plus try and error today I connected most of the chat solutions I use to my own Matrix server to have only one UI for Facebook Messanger, WatsApp, Signal, IRC and Matrix.

What's left is Slack and Discort, but because I'm not a admin in those channels it will be more complicated to connect those, but I'll give it a try.

If you're on matrix you can chat directly with me there, my username is @jeena:matrix.org