Thank you for the reply. Ultimately, I ended up digging deeper into the allauth docs, per your suggestion, and I went a little bit further with the "SOCIALACCOUNT_ONLY" option. It turns out that the errors I were seeing were related to the sign up button referencing a view that didn't exist. I solved this in an admittedly ugly way, by removing the sign up button from the postorius and hyperkitty templates. This will make upgrades a pain, as I'll have to account for this in the future, but it appears to be exactly what I was looking for.
Thank you for your insight!
The whole point of email commands was to allow anonymous signups (more precisely, pseudonymous signups tied to a mailbox). If you don't want "anonymous" signups, you don't want to enable the email commands.
Also, thank you for this. I figured this was the case, but I wanted to make sure.