@brichardi, Thanks for posting in Q&A.
According to your description, I know you are looking for a way to batch enroll Windows 11 devices. Before going on, I would like to confirm if the devices need to join on-premise domain or just join to Azure AD?
If it needs to join on-premise domain, then the devices need to do Hybrid Azure AD join, the method I can think are GPO enrollment, co-management and Autopilot Hybrid Azure AD join. From your description, I notice Autopilot is not your choice. And it seems you have MECM in your environment. If you want the devices to be managed by both MECM and Intune, then co-management is your choice.
Paths to co-management - Configuration Manager | Microsoft Learn
However, if you just want Intune to manage these devices, you can also consider GPO enrollment:
Hope this can be helpful. If there is anything else you need, feel free to contact me.
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