I'm new to Teensy, and I'm waiting for my new Rev D Audio Adapter, due in a few days, but meanwhile, I thought I'd try
a PT8211 board that I've used with Teensy 3.2 and 3.6.

Can it work?

I tried on a breadboard (just as I've done with 3.2 and 3.6), and accounted for the relocation of RX2, but haven't gotten any sound.