You can achieve this by modifying the characterBP and implementing a blueprint interface, I’ve done this myself based on Hakabane’s inventory tutorial and would be happy to make a, perhaps more elaborate step by step approach into making this as long as Hakabane approves of that 
Also if I am going to make this, would you guys like it to be a step by step from creating the inventory system or just the interface implementation “mouse1click” to pickup?
Kind Regards, J