Move AD user to child domain without breaking AD Sync and Office 365 mailbox

Background:
We have a root domain with two child domains (all in the same forest).  ADSync is setup to sync our AD users to Office 365 for all three domains (One ADSync server in root domain that syncs users from all three domains).

Problem:
We have several users in the root domain that need to be moved to the child domain.  Because all our domains are server 2012 functional level, we cant move users to a child domain (ADMT is not supported on server 2012) so we are thinking we could just delete the users from the root domain and create a new account for them in the child domain.  Unfortunately, I fear this is going to break the accounts link to Office 365 so when the new user account is setup it will get a new mailbox in Office 365.  We need to figure out a way to move these users to a child domain in a way that allows them to keep their Office 365 mailbox.  Any ideas?
itsadmin1Asked:
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itsadmin1Connect With a Mentor Author Commented:
We created the child domain and moved the users into that OU.  But we had to setup ADMT on a 2008 box and move them that way.
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Vasil Michev (MVP)Commented:
Hm, didn't know ADMT is not supported on 2012. Only option is export to pst -> import in the new account.

Deleting the user object in AD will delete the corresponding one in Office 365 as well, disconnecting the mailbox. There is no way for us to reconnect it to a different user, Microsoft can still do it I guess, but you will have to convince the first line for weeks to get it escalated, and even then I'm not sure they will agree to do it.
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itsadmin1Author Commented:
Sorry for Lack of Details
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