Not particularly easy, and not terribly worth it, to be honest. I pulled it off with some work, but there are two basic setups:
Setup 1:
First, you'll want to put the game in stereoscopic 3D using TriDef.
Second, you'll stream the game using Trinus. This method relies on you, the user, the adjust the camera to make it as VR-like as you like. It's not very immersive, but it works with just about everything.
Setup 2: Get unofficial VR patches for some of Illusion's games like Honey Select. Run it through a program called RiftCat, which basically tells the computer you've got the necessary hardware and streams it to your phone. This method usually means you need an input method that works with the patch (might be mouse, but might also be other more esoteric choices), and can be buggy as hell. I haven't personally had a lot of luck with it.