Personal Mirror Drop (PMD)
EDIT:
VRChat has implemented a Portable Mirror. 7/30 its in beta. Likely to live within a week. Its really good. I'd recommend using that. I can still maintain this and update it if desired though.
This is a droppable local mirror that you can use within VRChat. This has limited range/depth. It is 2d. It's not a perfect replacement...