Signal messaging

Judging from the links you're pointing to, unless they move away from the Electron framework, it doesn't look like a possibility. You might reach out to the project on Github and ask that as a feature request.

Searching for a portbale version of Signal I found this page: [Signal Desktop Portable (64 bit)

[link to illegal software site removed by mod JTH]

I checked this - it is done with the Portable Apps "toolkit".

here's the project page:
https://github.com/portapps/signal-portable

direct link to the executable download (Windows):
https://portapps.io/app/signal-portable/

PS. Note the current startup problems for V5.34, click on the issue to find solutions (haven't tried them yet) (previous versions don't have the startup bug, but they are outdated and won't connect to the current phone version without an update)