Chief Engineer for a foreign owned and operated company, onboard floating power plant (ship). He does not satisfy the 330 day rule. Question: He must continually quarantine for 14 days out of his own pocket, due to Covid (i.e., Mexico City before going on board ship in Trinidad).  The expenses are mandatory, but not compensated for by foreign company.  The time is not even considered "travel time" by the employer, but rather as uncompensated "dead time". 

Is there any relief or deduction anywhere?

He is NOT a W2 employee.  He is issued a "letter of earnings" detailing earnings, allowances and foreign tax paid.  Obviously, the elimination of Form 2106 rather cooked his goose.