A quick-add package should work. Macs that are in Apple Business Manager can be enrolled by using the "sudo profiles renew -type enrollment" command after you have switched the MDM server setting in Apple Business Manger to Jamf Pro, and your Jamf Pro server has synced with Apple Business Manager. You likely need to unenroll them from Meraki. The last time I tried running a quick-add package on a Mac that already had an MDM profile installed, the enrollment failed. I didn't know it was already managed. I don't know anything about Meraki so I wouldn't know the best way to unenroll. I'm sure someone here knows a good way to do this. You posted this in the best place possible. Also, the Mac Admins Slack channel is a great resource.
