Built-in microwave is above the range.So what is above the range?
Definitely be the easiest and less expensive way to address it and easily reversible.Not an electrician thing, but they now make an adapter specifically for this purpose that will plug into the 4wire range outlet and provide you with a 5-15R outlet. They are UL listed and have a 15A OCPD for the outlet (a non-replaceable fuse, but it’s legal). Look at the Southwire 9042SW8801