Nevermind, i just tested everything again and indeed it does work, must have been an issue with the environment i was testing it in, maybe it wasnt detecting any surfaces and hence not rendering anything.
but can confirm, it did load the Halo GS, performance wise was a bit hard but i expected that, i intend to use small splat anyways so yay! it works
Ill test in VR during the weekend also and report back if it works too