I got this cable to simultaneously charge and extend my display to an ultrawide monitor and it works great! As a bonus, the cable also work as an extension charging cable in a pinch! https://www.amazon.com/gp/product/B078M57FVJ/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Thanks for the info! It almost seems like I'm better off just getting a DeX hub like this instead of an HDMI+PD adapter like this. It seems like the only advantage of the HDMI+PD one is the simplicity.