Delay New hire Employee ATOM Feeds till the required attributes are not Populated

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We would like to explore the possibility of Delaying the New Hire ATOM Feeds till the required attributes are not Populated. e.g. Email Address. After Hiring is completed these are pulled through downstream system after the employee data is sent to the downstream systems. For Example: when the employee is hired in HCM the email address is blank and data is pushed to email system where the email address is generated and the same email address is updated in HCM. We are planning to use ATOM Feeds for certain downstream integration. But the downstream application requires Email address as part