Blocking main-hand or off-hand when changing the weapon set

Wish there was an option to lock a slot—for example, the shield slot. I use weapons with different elemental properties, but I don’t want my off-hand to change when switching between these two weapons. Alternatively, I sometimes stick to a single weapon and want to lock it so that it can be used in two different weapon sets. However, in some situations I’d opt for a buckler, while in others I’d choose a shield.

I think that this would be relevant, considering that the game facilitates the use of different weapon sets for various situations.