If you make two slab doors to fit the opening(3/4" thick) and paint them wall colour, then mount them flush with the wall with European cabinet door hinges(I would recommend salice but Blum would be ok). Put touch latches on the back and you're done. Nice and clean, only a couple margin lines.
The doors would have to be a plywood core with a smooth skin so the paint would be smooth. Also watch for a sheet that is flat as some plywood likes to warp pretty bad.
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