I had pretty much flawless results using OpenComposite to upgrade to OpenXR with an HP Reverb G2 and an RTX 2080 Ti.
So I added it to PCGamingWiki:
https://www.pcgamingwiki.com/wiki/Live_for_Speed#VR_support

OpenXR Toolkit doesn't seem to load though, and I suspect it's because the game uses Direct3D 9, and only 11 and 12 are supported, at least on my GPU.
https://mbucchia.github.io/OpenXR-Toolkit/#supported-graphics-cards