Thanks for posting, this thread is gold, hope to see more conversations like this.

FWIW, for testing your setup with an additional software provider (good to do), you could try Specter. It's available on server edition (with Start 9) but for hardware signing you would need a desktop version

Nunchuk are legends for making their co-ordinator software available for free, and 100x more so for this letter right here: https://twitter.com/nunchuk_io/status/1494885897577271299

This tells you everything you need to know about the company culture :-)