Vulkan requires additional and lengthy programming, I'm not so sure if you have to create entirely new shaders for it, as Dani is using Unity, but I believe Vulkan and OpenGL use completely different programming languages which may make it harder to program.
I do agree with your suggestion, but it's often best to know what developers can and cannot do. I have no knowledge in Dani's programming skills, but I am certain that it may take a while for him to do this.