Delta Air Lines

I'm required by federal rules to buy a ticket through an American carrier for work travel, which means my flights have to be booked by Delta even if the flights are operated by AF/KLM. I want to fly on AF/KLM stock to get better MQDs, though. Can I call either Delta or AF/KLM to have them change the ticket stock after purchasing? I know the stocks CAN be changed, because KLM were forced to do it in order for them to book me on a new flight after mine was cancelled. I just don't know if there are special code words I can use to get them to do it for me.