Shortened the cable a bit and the easiest way to get all the parts working is to make the Chromecast dongle look like an existing set-top box. The concatenation solved the endianness problem and all is well.
USB to USB Type-C adapter
18 Review
Cable Baseus Cafule USB - Lightning, 1 m, black/red
26 Review
Apple MFi Certified 3-in-1 Lightning to USB3 Camera Adapter for iPhone and iPad - Charge, Connect USB Drive, MIDI Keyboard, Mouse, and More!
12 Review
4K / 30Hz USB-C to HDMI Adapter - 3-in-1 Type-C Converter Cable for MacBook Pro, MacBook, Mac Pro, iMac, Chromebook, and USB 3.0 Type-C Devices (2017/2018)
13 Review