I'm not familiar with DSD/mbelib but based on what I saw with a quick web search this sounds like a really interesting attack vector. I do want to perform some more research in this area, so thanks for the idea.
I can't find it now, but in the olden days of the Internet I read an article about how an up-and-coming band had "hacked" RDS to switch radios to play their song when it was played out on the local station.
The local station had a UHF link from the studio to the TX site that was audio only, a very common setup in the mid-90s, and the RDS flag on the transmitter was switched "in band" by sending a burst of tones over the audio feed, right at the start of the traffic jingle. Slap the traffic announce jingle cart in, hit the button, tune starts with just three quick DTMF digits. Uh-huh, you're seeing where this is going, right?
So if you put those three DTMF digits at the start of your single... :-D
Finding a bug in RDS would be pretty funny - https://en.wikipedia.org/wiki/Radio_Data_System