There isn't anything out-of-the-box for this that I'm aware of, but as you mentioned, you can run dsregcmd /status
and then return a boolean that shows if the device is compliant (hybrid joined) or non-compliant (non Hybrid Joined). There is an example of this in this related Reddit thread, Collection for Hybrid Joined Devices.
You could also probably create some custom script to filter out the non-domain joined devices. There is an example of the opposite query here.