Allow for both a main-hand and off-hand item to be added to the same action bar slot

I would implement it as when you put a single handed item on the action bar if you drag the opposite handed item onto the same slot it would make a place for them both in the same slot.
Then when pressed it would equip both items at the same time.
 

This will mainly help with bosses such as Dag Kings where you hybrid and if you are using dual wield over 2h or also for bladed dive.
 

This idea could be further pushed to allow for other equipment to be included such as planted feet/vigour switch on same slot or melee 2h + laceration boots for Raksha pools.
 

I know this may be a thought of reducing skill needed to press 1 extra button with switches but I feel it would at least make switch less tedious and also free up some slots in action bars which would give something for the more elite PvMers who don't care for the 1 less input.