This is pretty common among animal part's long study time for low LP (Moose Antler's are terrible being 2x2 slots)
So since it's October and Day of the Dead is coming I figured what if we could craft the Alebrijes from that Disney movie https://en.wikipedia.org/wiki/Alebrije

The curiosity could be carved out of a wood block, crafted from clay or smithed from Tin (with a little Paint)
It should give very little lp by itself and be 2x2 slot's big but would allow animal curiosity's to be attached to it similar to gilding (5 attachments Max and must be different curiosity's)
The Alebrije itself should act as a softcap for any other Curio attached but should always maintain the same study time
Since were talking about combining curiosity's why not allow certain item's to be enhanced
For Example:
1) Flower Bouquets should allow other flower curiosity's to be attached
2) Ant Farms should allow more ant's to be added
3) Feather Sunfeather should allow more feather curio's to be added
4) New Item "Easter Basket" to add Easter eggs
5) Fossil Collection could allow more fossil's or strange crystals added
Sorry if i'm rambling on