Ability To Block With Left Hand
Armor On Left Hand Absorbs Damage The Way A Shield Would
Ability To Put Shield/Blocking Enchantments On Gauntlets

I feel that adding these actions would not be that hard to do sense they all exist just not merged together.

why block? both hands should be used as weapons, anyway, all the missng skills should come back, including unarmed

Enchant gauntlets with '+ unarmed damage', and take the perk where heavy armor gauntlets do damage. There you have damage.

Blocking... sorry you don't want to block a sword or an axe with your arm even if you have some armor. Your 'some' armor is likely not as thick as a full shield. That axe is going to split the armor... and your arm.

I'm saying your armor can block like a shield with blocking enchantments. It wouldn't be a strong shield. More like hide armor. And you can make your blocking gauntlet stronger through smithing.