I don't know whether this answers your question, but I'd strongly suggest VR collaborations with some of the mainstream studios, just based on the format and style of the different studios. That said, here are the studios with (in my opinion) the most refined format that would work for new episodes in VR.
English language
1) AbbyWinters (see learn.abbywinters.com)
2) FTVGirls (stable cams in VR could be a cheap extra)
3) ALS Scan (the BTS photography sessions)
4) Backroom Casting Couch (mainly for their casting department)
5) Exploited College Girls (the original format, not post-2012)
For the JAV and Japanese content
6) GirlsDelta (read the interviews on their website, and English translations)
7) Nyoshin (Japanese creative stuff)
8) Zenra
9) CHN (Prestige Studio, the lending series)
10) GVG (Glory Quest)
