This series of processor is out of stock everywhere. Paul, I assume you have some inside information as to when it might be available again. Can you share some insight?

I would redesign using T4.1, but I really like having 25 analog pins to work with; I'm worried that using a MUX to read opamp buffered signals at high speeds (about 10K samples per second / pin with 11 bit resolution) might introduce noise or inaccurate measurements.