Got it done finally [BETA] Zooz Advanced Drivers BETA Updates
Its not great, but it works. The release notes is not separated so I put beta info in the existing one. I dont think you can pick which packages you want beta versions for, its sort of all or none.
Ideally you could just point to a totally different manifest for beta but I know due to the way HPM was designed this is not really possible. I came up with a solution though by putting the beta on a new branch, and then updating the main branch manifest to point to those files. When beta is over I can update the manifest on the beta branch (which is not used for anything) and then merge that along with all the changes to main.