Switchvox softphone running on Pcoip zero client

Running Switchvox PBX (since v1.0) with 20 licenses on a VMware server, 18 which have been eyeBeam softphones running on my desktops, but which will not be supported after 1.1.2019.

I was planning to move to all zero client hardware running VMclients with the Bria Virtualized softphone, but just found out that CounterPath will not sell Bria Virtualized Edition retail, and will not sell if <200 licenses.

Any suggestions for a softphone that runs on PcoiP zero clients (could install Microsoft Remote Clients or VMware clients?