https://www.diyaudio.com/forums/group-buys/207438-ian-asynchronous-i2s-pdif-fifo-kit-buy.html
Dual mono ESS9038 HAT to name one of many.
@spockfish Harry & @Dan_Knight Dan maybe see what you can do with iancanada on supporting in Ropieee and DietPi if it needs anything done from your side of things.