Using multiple employer/cost center/profit lines to differentiate headcount

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A portion of our workforce has a "home" Legal Employer, Cost Center, and Profit line that is used for payroll purposes, but have a different Legal Employer, Cost Center, and Profit line that is used for headcount purposes.  For example, "Employee A" resides in the United Kingdom and is paid by that Legal Employer with a specific cost center and profit line.  Costs are then transferred to the the U.S. Legal Employer with a different cost center and profit line, as he is part of the U.S. team's headcount.

We have considered adding a Profit Line DFF to the Department object, so we can track the home information, and then add three DFFs to the Assignment's Job Details to capture the headcount information.