Use Wire then. You can either use you e-mail or phone number. Uses Signal OTR protocol and a single sign in for all your devices. The clients are open source.
IMHO Signal is only usable on smartphones. I don't want to link my desktop client with the phone, so I use Wire on the desktop.
Oh and Wire is a Swiss company. I see you run your blog off the .ch TLD.
That has other issues though. Last I checked you're unable to remove contacts from your contact list. I'm not kidding.
You can 'block' people, but simply removing them? Nope.
Why do I care? Because at one point the 'upload all contacts to Wire to help you find them on Wire' wasn't optional (I understand it is now) and now I'm stuck with entries on my contact list that I just don't care about. Very weird..
IMHO Signal is only usable on smartphones. I don't want to link my desktop client with the phone, so I use Wire on the desktop.
Oh and Wire is a Swiss company. I see you run your blog off the .ch TLD.