USB adapters or going to be spotty because Apple does not support anything but direct connection. No Hubs or Y adapters. USB C male to USB female perhaps? I suspect the reason Carlinkit made a new model without a hardwired cable was to accommodate cars that are starting to come with USBC. Could try a few adapters or bite the bullet and switch. If your still within your return period I would suggest returning it. C2PlayAir though is not to my understanding very good about returns though they claim on their site to take them.
Did you try somthing like this?
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Anker USB-C to USB 3.1 Adapter, USB-C Male to USB-A Female, Uses USB OTG Technology, Compatible with Samsung Galaxy Note 8, S8 S8+ S9, iPad Pro 2018, Nexus 6P 5X, LG V20 G5 and More
USB-C to USB 3.1 Adapter The SuperSpeed USB-C Converter From ANKER, America's Leading USB Charging Brand • Faster and safer charging with our advanced technology • 10 million+ happy users and counting Huge Compatibility Allow your USB-C phone, tablet or computer to work with almost any USB devi...www.amazon.com
I bought this cable and adapter to hopefully work with my USB-C version (if it ever gets here). My USB port is behind a dashboard door which also houses an AUX, SD Card and a nice tray to slip your phone into. I really want to stick the wireless dongle in there and close the door. This cable is the only solution to not having the USB plug get in the way. I am skeptical and agree with you on connectors and adapters. Not the end of the world if I can't close the door. First things first, need to get it in hand and working with the supplied cable.

Anker [2 in 1 Pack] USB-C (Male) to Micro USB (Female) Adapter, Allows Micro USB to USB-C Data Transfer, Uses 56K Resistor, Works with Galaxy S9, MacBook, iPad Pro, LG V20 and More
USB-C to Micro USB Adapter The Small and Simple USB-C Converter From ANKER, America's Leading USB Charging Brand • Faster and safer charging with our advanced technology • 10 million+ happy users and counting Huge USB Compatibility Use your USB-C phone, tablet or computer with your Micro USB ca...
www.amazon.com
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