To switch configs you need to access a views properties, I dont see how without the dwg open.
Right Mouse Click on the drawing view in which you wish to change the config and go to properties, which brings up this dialog box:
Choose USE NAMED CONFIGURATION and then use the drop down to pick.
You have to do this for each view in a drawing and then choose the corresponding config for the BOM
There was a macro for applying the choice across all drawing views in the old rendition of the forum, don't know where it was tho...
Hope this helps.
I read too fast, I missed the without opening the drawing part...