Hi Pedro,
I was researching into turn Traktor controllers into standalones (class compliant) and I found your post. I want to share this resource due I believe it’s the missing piece for improve the final step for your amazing job.
This is the library which Vicenzo was building before join NI to help develop M+. It’s not up to date because the improvements he had make in between should be at M+ guts but since there are lots of users reporting issues with usb and since NI doesn’t seems willing to release a “simple midification box” I believe bomebox could be the missing dot (and maybe you could do a deal with NI like Vicenzo did back in the day) and get special “bomebox for NI”.
Cheers.