Most pilots are not currently qualified to serve as flight attendants, but they could be trained. The training and experience requirements for a flight attendant are less than for a pilot so it wouldn't be difficult to qualify them. If they were willing...

Most pilots are not currently qualified to serve as flight attendants, but they could be trained easily enough following an abbreviated syllabus.

Since pilots are already familiar with all the aircraft emergency equipment and procedures, training would just need to focus on specific tasks in different areas of the cabin. That, plus operation of beverage and food service equipment.

It wouldn't be a difficult transition if the pilots were willing.