I've found connecting a usb-c to usb-a adaptor and then a usb-a to usb-c adaptor (effectively, c-to-c, but with two props) some times will trigger the traditional power deliver. Try on either end of the device.
The only two devices I have that still need it, a mouse and beard shaver, I use them irregularly enough (charge around once every few months) that this solution is good enough for me instead of having an extra plug+cable. Yes, it won't charge as fast as an actual usb-a to c cable, but for my case that's good enough.
