If I learn VRChat implementation in the future, I'll retroactively update some of my models to have an alternate version with the VRChat rig. But right now I don't have plans for it yet, especially given that the models aren't optimized for VR either.
Hello ! You are free to do whatever edit to the model as long as you do not share/sell the files publicly. As for making the vagina an official edit, it'd require me to redo the whole UV layout and texturing setup, which isn't something I'd bother myself to do.