This plug-in allows GPU or CPU accelerated viewport rendering on all OpenCL 1.2 hardware for the open source USD and Hydra system. You can build this plug-in as a USDView plug-in or a Houdini plug-in.
Why do you think that https://github.com/GPUOpen-LibrariesAndSDKs/RadeonProRenderMayaPlugin is a good alternative to RadeonProRenderUSD