How to allow Messages iCloud sync with a secondary Apple ID?

[boatymcboatface]

We are experimenting with using Managed Apple IDs as the primary Apple ID for our end users for all the reasons. We hoped the user could then use their personal Apple ID with Messages, but the option to "Enable Messages in iCloud" is disabled in this configuration. So Messages can work with their personal Apple ID, but all the syncing goes away. Any work around here? 

[AJPinto]

When a device is signed in to with a managed AppleID, Apple disables iMessage. To not disable iMessage the Mac would need to be logged in to with a personal AppleID. The managed AppleID would be used with user initiated enrollment, and would serve a difference function involving BYOD.