Not sure if this could be considered for inclusion or not but worth a try. ExpressVPN is a a VPN client that supports a multitude of platforms including Linux. Unfortunately it only includes packages for Debian/Ubuntu and RHEL based distros. (deb and rpm). Below are the links to both the deb and rpm files.
https://download.express-vpn.xyz/clients/linux/expressvpn_1.1.0_amd64.deb
https://download.express-vpn.xyz/clients/linux/expressvpn-1.1.0-1.x86_64.rpm
At first glance the dependencies seem to be these according to the control file in the deb: init-system-helpers, initscripts, iproute2.
iproute2 was in the repo but I couldn't find packages for init-system-helpers and initscripts in the repo.