Item Pieces

I have a question about how the bow works, in that two items function as one when collected. Would it be (easily) possible to make a quest rule that allows the bow and arrow to be collected as one item?

This brings me to my idea: Item pieces. If the bow plus the arrow adds up to the bow and arrow, why not other items? A broken sword, for instance, that could "magically" reforge itself when the pieces were reunited. Or a set of armor/clothes. You could find a hat. A string would say (can we do item->get->string yet?) "You found a new hat! But it doesn't match your current outfit. Find some matching gear to wear it with." And when you collected the shirt and pants, you'd be up to blue or red ring or whatever. It certainly wouldn't be a huge, game changing feature by any means, but it would be useful for small quests that didn't involve collecting every possible item.