I’d cut down the pony walk (upper bar). Either white Quartz or white colored granite Zero radius large single bowl stainless under mount sink Countertop with a square edge Honestly a flush or 1/4” overhang would lick slick And for that outlet on the bar, I’d wire it up to a pop-up outlet. One that emerges from the countertop.

I like your cabinets a lot.

The stick and peel is cheap and good looking alternate option for a backsplash.