I like the Codex a lot. I think its performance is just a hair behind the QB-9 DSD / C-5xeMP (I have both) but others have come to the opposite conclusion. One thing to keep in mind is that the Codex gets pretty hot when left on for a few hours, so I wouldn’t put it in a completely enclosed space without some ventilation.
There is a converter for all sorts of digital inputs to USB made by Mutec, called the MC-1.2. It’s a little pricey at $450 new.