Just like you can read clip names from a track for “Sections” or “Lyrics” it would be great o add a 3rd way to send clip names via OSC and follow the key of each song, even changing within songs.
It would work exactly like sections.
You could do this with a custom OSC track. To send clip names to an OSC client, create a new track and name it something like Song Keys +OSC [127.0.0.1:8001/key]. In this case, all clip names will be sent to 127.0.0.1:8001, e.g. /key A#, which you can then use with TouchOSC or another client of your choice.
Let me know if this works for you! 
Yes I’m already doing that and it works amazing, it would just be great to have it natively as part of the other set of commands! Just a suggestion, I’m doing fine with the +OSC tracks! What a great addition!