I think adding compatibility to have the shard in a baubles slot would be great feature and a huge convenience for explorers who need as much inventory space as possible.

I'll have to think about it. I'm not really keen on the idea right now though. You can already stick the shards in your offhand to save space.

The only problem with offhand is it takes up the viewport. My main reason for this suggestion, is because I wanted the kills to gradually build up as you explore, and not have to constantly hold the shard everywhere you go in your hand.