The concept of working on the stand-alone version is nice to know. Most Dev's in this realm for VR don't put in the effort for Quest 2 stand-alone compatibly ( or god forbid android versions).
From what I could tell you need to be a patreon to use Vroid to make character's yourself. But maybe I misread something 🤷♂️
Regardless, from what I've seen of the selection I don't think becoming a patreon would help me to get what I'd want as it doesn't seem like VRoid is capable of more detailed design geometry.