Comment by varenc

Like Op, I also have been tinkering with USB-C PD and found another hobbyist tool on Tindie that does exactly like you describe! You can specify the voltage and current needed, and it'll then make sure you get that power from a compatible charger.

This is the one I got a while ago it and it works great: https://www.tindie.com/products/clarahobbs/pd-buddy-sink/ though there's several other options out there