Another V800 / Zwift user here.
I use a Wahoo TickrX for my HRM (simultaneous ANT+ to Zwift and Bluetooth to my V800) and a Wahoo Blue SC speed and cadence sensor on the bike (again, simultaneous ANT+ to Zwift and Bluetooth to the V800).
The ANT+ dongle I use on the PC is a Suunto Movestick Mini.
Works perfectly. Hope that helps.