I went ahead and ordered them later that day. I had seen the custom options, but since I don't have a 3D printer/have awful eyesight, I wasn't sure it was worth the hassle of trial and error/poor fitting lenses. I am under the assumption that they will not have an effect on the visual quality, but I can update you if you are interested. I never tried the DK1/2, I've only really put time into the Vive and Index.

I think it would be neat if Valve made it so you can more easily pop the lenses in and out, allowing you to pick what you need prescription wise (and in your case fresnel vs non-fresnel). I am unsure how well that would work, since the focal distance between headsets could change.