Access panel won't really work. Electrical and plumbing are already stubbed up from the concrete (remodeling an existing outdoor kitchen); a SS sink cabinet goes on the inside part the wall where the stubs are, and the outside will be faced ledger stone stacked block.
The original install had a painted wood panel where the utilities stub up with a j-box for the electrical. (Walls are only 4' +/- high). I'm trying to avoid duplicating the same 'cause it looked kinda crappy. Major sun exposure (and heat - up to 120+ F) on that wall, and painted surfaces don't weather well.
Probably need to pull new wires as the ex wires won't reach the new receptacle. And pull in a dedicated circuit for the outdoor fridge. None of this was GFCI protected; I plan to do it correctly (well, have the sparkies do it correctly!)
This is a mini-home on the Colorado River. My wife's happy place... (And mine)