I know that Rhino3dmIO is available as a Nuget package. We currently also use a home-brewn NuGet package for the full Rhino SDK and GH, which is served from our own NuGet server. For us this is very useful to upgrade the version solution-wide. If you want I can send you an example (I’m a bit hesitant to attach it here, because you never know where it ends up), because I believe this could be useful for more people.
We recently made RhinoCommon and GH available through nuget also. I guess we may have forgotten to mention that here.
Oh, that is indeed news to me
What we use though is the whole thing: C++ libs & headers, RhinoCommon and Grasshopper in one package.