This product was mentioned in
with an average of
Amazon has it available, I have not used this brand and can't personally speak for their quality.
But now we know that it does exist, and can build from there.
Cable Matters USB C to Mini USB Cable (Mini this works for me! USB to USB C Cable) 3.3 Feet in Black [link]
Why not just grab a cheap looking cable, which is cheap, to hold you off before going custom
One of these should do the trick, but it might be a bit long for your application.
I'm looking at the exact same issue. I know this post is a little old but from Asus forms I have found that lian-li makes a USB 3.1 Gen 2 header to usb type c cable.
From that you can get a usb type c to usb micro adapter.
I haven't tried it yet but it seems like a good solution.
I second this. I recently did the same. Works great.
Cable Matters USB 2.0 Type C (USB-C) to Mini B (Mini USB) Cable in Black 3.3 Feet [link]
Camera goes to USB mini type B to USB type C. One cable. OH NOES.