Could also dip into Tempest Cleric for a few levels. Get Heavy Armour/Martial Weapons and a 2d8 reaction damage if hit in melee at first level, and at second level Destructive Wrath, a channel divinity ability that allows a lightning/thunder spell to inflict max damage. Plus extra non-sorcerer utility spells, of course, but you probably won't have stellar wisdom without an appropriate buffing magic item.
Thematically good as well.
