For the benefit of anyone else that runs into this issue, we found that the CP2104 like the one found in the Adafruit CP2104 Friend https://www.adafruit.com/product/3309 worked well with our Mac.
For the benefit of anyone else that runs into this issue, we found that the CP2104 like the one found in the Adafruit CP2104 Friend https://www.adafruit.com/product/3309 worked well with our Mac.