A rubber grip mat for the bottom of the drawer is a good start to stop everything sliding about. We operate same type and have convinced the boss away from champagne flutes which makes life simpler and saves on breakage.
Other than that I am not aware of any aftermarket options, perhaps you have stumbled upon something!!! All you have to do is charge same exhorbitant prices that Cessna do and you should be able to retire early!
Good luck