I fear you'll you get almost nothing from dipping into Wizard. Ritual casting, and some low level rituals, might be somewhat useful in tabletop but those spells and ritual casting itself don't exist in BG3. Yes, I'm aware there's is a feat called 'Ritual Caster' in the game, but that feat almost certainly does something different than 5e ritual casting.
So, you'd gain three cantrips, five first level spells, and one charge of Arcane Recovery. And you'd lose a spell known, of the 6th level or lower, as well as a feat/ASI. I wouldn't make that swap, but it's up to you. Of course, I'm assuming multi-classing works like 5e for that appraisal.
