The NNTC Vulkan sample is working (3000+ lines of .cpp later). It supports VK_NV_cooperative_vector for decoding. So the same inference hardware the neural guys are using benefits NNTC, too. I'll have this checked into GitHub after testing on more hardware.
source & further reading
richg42.blogspot.com — original article
Fitting Neural Textures and PBR Material Maps with ES (No Backprop)
Notes on NNTC vs. neural texturing
NNTC repo now on GitHub