In Graphics API we already have OpenGL Core(default) and Vulkan. I just don't know how unity player decides which Graphics API to use when Auto Graphics API is enabled.
Most likely it uses other options only if default is not supported. I can set Vulkan as a default, but i'm not sure if game will not run worse on Vulkan.
I did tests on Windows and all other options showed worse results. Default DX11 was best.
Also, how exactly vkBasalt works? If via dll injection, then in close future you may get ban.