Alchemist Lore?

What I was wondering is this. Is there an accessory that gives the user the Stash ability that is available to the Alchemist Dressphere? Kinda like White Lore or Black Lore does. If not is there a Garment Grid that allows the use of alchemist abilities? If so is it able to be attained in chapter 5?

Unfortunately no. You basically have to use the Alchemist DS to use Stash. However, you can enhance the effectiveness of items with Key to Success.