The Hops connection to CPython library is open source:
The nice part about Hops is that the backend process can be completely outside Rhino.
To use Rhino.Inside directly in QGIS, it would have to be on a Windows operating System and it is easiest if QGIS had a .NET SDK. Rhino .Inside is also Open Source, here:
Those seem to be the best candidates to connect these platforms.