How to move outlets from backsplash to under cabinets

We are renovating our kitchen and will be doing a full height countersplash. We want the seamless look of no outlets to showcase the stone we chose.

I know this is easy for a new build, but has anyone moved backsplash outlets up in a renovation? What was the process like?

We have 3 outlets that are in the middle of circuit that we need to move up onto two cabinets (see photo). I worry there won't be enough slack in the wiring, or that it won't be possible to maintain the circuit.

Any tips?

Excuse the renovation mess and crude drawings.