Best camera for turnkey studio recordings
I ended up posting basically the same question over on the dpreview forum, and got a number of replies. In case someone else stumbles across this post in hopes of getting an answer, the contributors seemed to recommend the following, as of Feb/Mar 2020:


Panasonic Lumix GH 4 or 5 (around $600 and $1300, respectively, body only)
Blackmagic pocket cinema 4k camera (around $1300, body only)
Panasonic AF 100 (used for $500-600)