Copper golem chest labelling

I quickly realized a problem with the copper golem after trying it out: in a storage system, chests can often get emptied out, especially if you have them coing into a hopper system. So, the copper golems would not put items in the chests that the items were assigned to earlier. An elegant and IMO a pretty simple fix for this would be to have emty chests with items frames of an item only accept the item inside the item frame. Perhaps adding item frames to all 6 sides of the chest would allow for 6 items to be accepted (or 10 for a double chest), but I think even having it accept just one of them would be sufficient.