Well atm you can use the LPV, Nvidia light system or the Epic Games test with DFGI.
I made a simulated GI system time ago, and I posted what I do to simulate the GI with a example and engine changes, you need to setup the scene with that old system but is less expensive than all GI systems RASL - Upgrading the real time light by Hevedy - Work in Progress - Unreal Engine Forums
Note: you need to setup the scene and overload the materials, but give a result about 5-10FPS less than a normal scene with realtime light, that is 20FPS of difference or more with the first less expensive GI solution right now LPV.
My solution can run probably in all VR systems, but not tested.