Use qubes os with whonix recommend also vpn router spread as many as possible
Buy VPN router
Buy a laptop that designed for qubes:
Qubes OS has very specific system requirements. To ensure compatibility, we strongly recommend using Qubes-certified hardware. Other hardware may require you to perform significant troubleshooting. You may also find it helpful to consult the Hardware Compatibility List.
Even on supported hardware, you must ensure that IOMMU-based virtualization is activated in the BIOS or UEFI. Without it, Qubes OS won’t be able to enforce isolation.
www.qubes-os.org/doc/certified-hardware/
Star Labs StarBook
First, install qubes on a usb
Second, install Qubes on the laptop and install qubes:
www.qubes-os.org/doc/installation-guide/
Install Whonix:
www.whonix.org/wiki/Qubes/Install
Although differnt how to create xmpp account unfortunately on tails with otr pidgin, similar to dino on whonix: www.youtube.com/watch?v=HsSssbs-Sso Dino uses OMEMO over tor spread to friends secure chat