Could you use something like this direct USB-C to 3.5mm Audio Cable, eliminating the need for a dongle?
https://www.apple.com/shop/product/MDV84AM/A/usb-c-to-35-mm-...
https://www.apple.com/shop/product/MDV84AM/A/usb-c-to-35-mm-...
I didn't know about that, I'll think about it