Could you combine these and forego your own possibility of hiding behind your shield for an AoE and instead shield a companion within 5ft?
This would be the relevant part of Shield Master
If you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you can use your reaction to take no damage if you succeed on the saving throw, interposing your shield between yourself and the source of the effect.
When a creature you can see attacks a target other than you that is within 5 feet of you, you can use your reaction to impose disadvantage on the attack roll. You must be wielding a shield.
I'm guessing not but the question got asked at my table.