I'm not crazy about that idea. If these doors are going to remain open for the duration, they should open front to back, not side to side.

In a Front to back configuration, the airstream will keep them open. they may flutter a bit, but no biggie.

In a side to side configuration, each slight change in direction will cause a full deflection of the door in the opposite direction, so the door will be slapping back and forth throughout the flight.