I understand that the Teensy 4.0 supports S/PDIF natively. I don’t know if (and how) it handles subchannel data (channel status and user data) but the ITTS information is sent via the user data, as you probably already know.
I hope whatever chip you want to use, you’ll be able to get it. There’s a massive shortage right now.
https://www.independent.co.uk/life-style/gadgets-and-tech/chip-shortage-2023-intel-ceo-b1832618.html
===Jac