Recently got a new Osmo Action 3 (from Dec. batch) and really enjoy the quality now.  I also have a few of the original Osmo Actions that are still great cameras.  I was wondering if there is a case made by anyone that could go on the original Action and allow it to become compatible with the magnetic quick mounts?  It would simplify the process using the older cameras with the handful of magnetic mounts I've just purchased.

Hi there. Thank you for reaching out. Hope that you could get the best recommendation from our fellow DJI Members here in Forum. Just a friendly reminder, The Osmo Action 3 Quick-Release Adapter Mount is only compatible with the DJI Osmo Action 3. Thank you for your valued support.

it is possible with a gopro adapter plate


https://forum.dji.com/thread-285055-1-1.html

you can use ulanzi gp--16

Beautiful!  just what I was looking for, will make switching between them easier.  Thanks