Update Character in Prefab

Hi all,

I search a solution for this problem :
I create many prefab with one 3D model, the prefab have scripts with a list of differents locators in my model.
I use this locators for manage items with the character model.

My problem is : I change my model locators in motion builder and i want to update in Unity all my prefab with the new model. But all of my prefabs characters are not linked to the main model... and when I change this one the only solution i have found is to update each prefab with the new model and also update all of my script for settings locators..

Is there an other solution to update all my prefab with my new model ?

Thanks.