Here are some abandoned projects that you might like to finish. Don´t forget these are only incomplete developments. So if in the end it goes up the creek I don´t want to know.
This is is one possible way of implementing a RDS 2.0 encoder. I leave the decoder part for others.
In reality the above detailed stereo + RDS encoder was the front end for a digital exciter. The DAC is replaced by a DDS (eg: AD9858)