If I were you, at the island, I would mount a flush mount circuit breaker protected disconnect on one of the least noticeable places you can find. Make sure it doesn't interfere with the movement of the drawers, mount it so it's accessible from outside the cabinets and flush with the surface. It needs to have a cover over the breakers, but a waterproof enclosure is not necessary. Run your #6 to the disconnect, into 20 amp breakers, and run #12 to the receptacles.
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