I received my modded CD85 PCB back from Danny a couple of days ago where he carefully removed the S1 chip, configured the PCB so the clock connects directly to it, and added the wiring for I2S. He did a fantastic job, his workmanship is of a very high standard.
Not sure when I'll be able to have it up and running, hopefully soon. Looking at giving to Mario to compare directly with his CD94 running I2S so we can see how close or far apart these machines are.