The ENB injector should work if you want post fx, copying Windows system DLL overrides to a game directory won’t for a variety of reasons. Just be aware that this may be game dependent and most importantly that you are completely on your own with this.
Using multiple injectors that hook the same functions at the same time is a potential source of all sorts of problems and thus I cannot offer any help if you experience issues in such a scenario.
BTW: Apart from the above I would advise against that in general for performance reasons, some post fx can be quite costly in regard to performance. VR is demanding enough in itself, losing 10 or 20fps for some post fx is almost certainly not worth it unless a game runs well above 90fps. So at least be careful what you choose.