You have to find yourself a proxy for economic efficiency , you have to model your sustainability goals , and you have to make your own adaptive inventory model ! Basically you have to make your own optimization model including the constraints .

There never wil be a holy inventory model that does what you want. Every model is kind of a compromise, an approximation of what you would like to achieve . And therefore it is wise to make more models and to do sensitivity analysis . Modeling is an art! Good luck.