DIY USB Stick using PS2251-68

Hello, I am currently looking into creating a custom DIY USB 3.0 stick, and this component seems like the best option. It is, although through unofficial vendors, available in small quantities, other than the SM3280 series, for example, but sadly it's still propriatery. I wanted to ask the counsil if theres a collection of reverse engineering data for this devide or a leaked datasheet or something like that.