I also have a 16 amp level two that I had for my Spark EV, I now carry it and the factory one in the Bolt for emergencies since I now have a Chargepoint Level 2 at home that I have set for 32 amp on a 40 amp circuit.This was hotly debated on the Volt forum, as my former Volt has a factory EVSE with the same capacity. It sounds pretty safe based on the research some have done, as well as on how many have adapted it for 240 v. Still, I decided to play it conservative for the reasons you suggested.
I bought a 16 amp Clipper Creek Level 2 for our Volt, and now use it for our Bolt. That too saved me from having to upgrade my buried line to the garage, since that line supports the necessary 20 amp circuit.
OTOH I'm still driving our Bolt without the software update, and even occasionally charge above 80%, so who am I to talk about risk.