It is still GNM and GNMX, Playstation doesn't no Vulkan, and I am quite sure that just like with MoltenVK and DXVK, not everything can be mapped in a transparent way.
That's kinda a Sony problem. The best an Open Source project can do is build HLSL/SPIR-V IR and let you do the rest yourself. I don't really know what you're asking for besides that, it's how things have been since the PS4 launched.
