As for FRADU, you have no chance without previous fast jet experience
.
I know a Civi instructor that after falcons went onto the Hawk, he had no Fast Jet experience.
TTN ... I assume this is the RAF VR Instructors Brevet you refer to ...
If they'd thought about it, the RAF should have held onto those and then issued them to the new UAV desktop jockeys and told them the VR stood for Virtual Reality.