Hi @fabians and thanks for your query. It would be best to get in touch with Tobii Pro Support team directly @ http://www.tobiipro.com/contact/contact-support/ for an
answer to your query.
That being said, the Tobii XR SDK (& Ocumen Package) does indeed support the HP Reverb G2 and you can view the getting started guide @ https://vr.tobii.com/sdk/develop/unity/getting-started/omnicept/
As you can see, this is Unity based also, so hopefully should serve your needs? Best Wishes.