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An option for a table saw based key would be a set of the finger jointing blades that some suppliers have. Twin blades with offset teeth, stack in one sequence for 3/16in cut, stack in the other sequence for a 1/4in cut, produce a flat bottom cut either way, a single pass gives you the required finished dado width quite accurately. Most likely dearer than a quality 3/16in spiral router bit, but capable of giving you the slot you want with a single pass, whereas a conventional saw blade would be multiple passes for width, or a router bit would be multiple shallow passes for depth.
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