Is the following sentence ok with whichever?
Mr. Morrison would like an employee to help customers whichever one enters the restaurant (first).
Suppose Mr. Morrison was the owner of a restaurant, and none of his employees has arrived yet. It was 11:30 in the morning, and his restaurant was already full of people. He wished his employees would show up and serve the customers. It didn't matter which of his employees would show up; just anyone would do.