I had an idea for this product.
My guess is if you put it on the bottom of the board, vs the top, it might be able to sit flush with the coin cell cage.
You could also add a header for external power (at the base of the bean's oval) with a simple 2 pin connector like those uses on model airplanes that could also power the Bean (the red small kind, not the large yellow kind). They are widely available and if nothing else can be created with a simple 2 header pin.
You could also add a female header or double long male header on the top so you can use the same pins with the opposite gender plug.
Where could one acquire one of these creations? I was considering making a plastic case for the Bean that replaced the coin cell area with 2 AAA batteries molded into the case.