Dual wielding daggers with numeric shortcuts?

I've assigned num 5 for to my Daedric Dagger and num 2 to my Blade of Woe. When I tap 2 or 5, the weapon in my sword-hand gets replaced. in order to actually dual wield, I need to open up the favorites menu, and left click/right click to make it happen.

Is there a known way, by which I can change the controls to dual wield upon tapping?

Currently the only way to dual wield weapons with a hotkey is if you have two of the exact same items. Otherwise, the behavior is exactly what you experience (you replace the right hand with a new weapon).

There have been numerous mod requests of this on the modding forums for the PC, I'm sure something will come out for it eventually.

If you want use two different daggers, I believe this will actually be possible, using the same method as described here for spell-shield configurations:

How can I change spells (using hotkeys) in a spell+shield configuration?

For this you will need to have two of one of the daggers, and one of the other. Assign hotkey 2 to the dagger you have two of. Assign hotkey 1 to the other dagger. Then when you press 2-2-1 you put dagger 2 into the right hand and dagger 1 into the left hand.