Fast Charging for Wired Apple CarPlay - This is the solution
For USB-C PD power splitter
Bought this intending to route CarPlay data through one side of the board and a USB-C PD charger into the power input side of the board. This worked flawlessly and allowed me to overcome the biggest problem with wired CarPlay - the slow charging. Would recommend this board to anyone else attempting the same.
Did not engage in any communication with the seller, and the documentation was slight, so I can't speak to those ratings, but it's a simple straightforward product so I don't need to. 5 stars all around, you won't find a cheaper, better, or simpler solution from what I've seen.