They do, in fact make them. In fact, tom66's post states you can use the microwave and convection oven at the same time, up to 2000W total input power, so it's not an issue of outlet power.
A lot of kitchens in new construction for quite some time have included a separate, dedicated 20A run for a microwave. A lot are placed above a stovetop (with a built-in vent fan on the bottom) or in a special nook built into the cabinetry.
The last two houses I've lived in have been like this.
(I've got an 1800W microwave downstairs.)
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