Create a version of the GLSL spec with GL_KHR_vulkan_glsl integrated?

[dj2]

Using GLSL with Vulkan requires checking both the GLSL spec and then verifying with the GL_KHR_vulkan_glsl extension what is available. Would it be possible to create a new version of the GLSL spec (maybe with a different name like was done for ESSL?) that directly integrates the Vulkan extensions and removes anything which is not usable from Vulkan?

I don't know how invasive the Vulkan changes would be to the spec if they could be done with the current ifdef mechanism or not?