I wanted to go this route but they were always out of stock when I went to order one a year or two ago. Instead, I bought a pigtail-style adapter from Amazon that converts the barrel jack to female USB-C PD. I like it a lot, and I can still use the stock adapter if needed. I also put a little USB-C power monitor inline with the cable, it's neat to "watch" the power going into the laptop.

OMG, thank you!