A single larger diameter circuit is not necessarily going to be cheaper
or easier at all than two smaller circuits. Put the duplex output on
two halfs of a single split 12ga circuit (with shared neutral). You'd
be just using a single run of plain vanilla 12/3 romex, which is going
to be a whole lot easier and cheaper than going to 10ga or thicker, or
running more than one cable.

And do give my sympaties to the other patients when you get there.

-Kevin