So, I finally got around to try the workstation card with a VM.
Unfortunately for whatever reasons the sound is distorted and I have not been able to work around that :/
This was not an issue when using it with a physical host.
So to sum up (ESX based point of view only):
Goal: To use my zero client for playing games at at least FHD quality
1. Official way would be to use Grid Kk1/2 for shared or Quadro for dedicated box -> expensive, bad gaming performance (or even more $$$)
2. Consumer Graphics Card passthrough works for AMD/Nvidia locally (i.e. directly attached monitor/usb) but not remotely via rdp/horizon view
3. one can use KVM (HDMI/USB) extenders to transport output to another location (via Ethernet) but those are not cheap for good quality, will not work directly with Thin Client but KVM switch enables reuse of monitor/peripherals
4. Another option is the Teradici workstation card which basically does the same but can be integrated into a Horizon environment
4a. Use as intended - Physical Box with workstation card, install horizon client to enable Thin Client/Horizon access, or use directly (need session type change in thin client, slightly annoying
4b. Combines 4.a and 2 (Pass though workstation card to VM as well). Works for video, I had sound issues. No direct integration with View Connection server as view agent treats this as vm and not pseudo-physical so will connect only via vm so no external video functionality. Direct connect works ok.
It would have been great to get 4b working to have double use of the hardware, but for now I think I'll stick with 4a. Basically this just moves my old PC to a remote location and enables the use of the zero client as frontend.
Workstation cards can be gotten for around €100-150 so not the cheapest solution but no (extra) heat and noise in the office is great, so I think I like it