Okay I found one through a few searches : (not on Benson's google doc spreadsheet!)
Cannot confirm however if it's 100% up to USB C spec (there was one amazon comment of 4 total comments at the current time that stated it passed via checkr) + one answer from the seller stating it had a 56ohm resistor.
I've read that checkr doesn't test all aspects of usb c specs (i.e. compared to all that Benson might use).
Anyone try this or have another recommendation :
CableCreation Gold Angled USB3.1 USB-C (Type C) to Standard USB 3.0 A Female Adapter Cable - ~$8USD
Re: checkr app limitations - I had come across this thread discussion :
https://www.reddit.com/r/Android/comments/3su1nc/checkr_will_tell_you_if_your_usbc_to_usba_cable/