GraphicsFormat integer formats can't be used to create a Texture2D

There are Integer formats in UnityEngine.Experimental.Rendering.GraphicsFormat, however passing them into a new Texture2D() gives an error due to the formats not being supported for sampling on this platform.

I assume this is because they can only be used in a shader via Load or Gather functions, as opposed to tex2D/Texture2D.Sample functions. However my use case involves storing indices for a texture array into an integer texture. Currently I must pack them into a UNORM texture, and manually unpack them in the shader.

Is there an alternate way to create Texture2Ds using these formats, or am I stuck with Unorm textures?