Keeping same email address as source domain

Hello!  Normally when doing migrations we are migrating source tenant to target tenant with primary email address changing to the target tenant.  We are faced with a different situation for this particular acquisition.  We want to create the users in the target ad domain and M365 tenant. Perform migration but instead of user using new target domain they will keep their source domain as their primary email address.  So during the whole process the user will basically keep their User@sourcedomain.com

Is this possible using Quest on Demand?