May I suggest a placard in a conspicuous location:
Killer Items- Flaps
- Trim
- Spoilers
- Runway Heading
- Controls Full and Free
The title could be
Line up Check for squeamish managements.
All of these items have figured in takeoff accidents, but this is a list that should be kept deliberately short even though many SOPs specify additional pre-takeoff items such as lights, transponder, time, radar...