I’m surprised you didn’t run into problems with “normal” Rift apps on the 0.8 SDK, especially with nVidia drivers (I can’t speak to AMD drivers). For me I ran into a LOT of judder and black frames with SLI enabled for ANYTHING Rift-related, but that was a known issue. It’s only in the current 1.3 SDK and with the latest nVidia drivers that actual SLI support exists for VR applications so that’s not so much a VorpX issue as it is a Rift and video driver problem, IMHO.
FYI, I’m running the 1.3 SDK with my DK2 right now and it works just fine so all you’d need to do is upgrade your SDK and the new version of VorpX, when it’s released, should work just fine for you. Probably better than what you’re used to even. DK2 isn’t going to be “officially” supported by Oculus (so you can’t get tech support from them on it) but nothing in it prevents the DK2 from working for you. In fact there are several new things you could probably get on Oculus Home for free right now, not to mention the new SDK generally works a lot better, I think. There’s also a switcher someone created allowing you, with a simple batch file, to switch between various SDK versions. I’ve used it when I was on 0.8 to switch to 0.6 for some of the older things that were not updated, but I have not tried the new version so take that for whatever it’s worth.