love the idea, dont know if it would work.
here's how i;d do it in FCP:
first control click on the track, and make independant
rather than markers, blade the sections you want.
open item properties for the sections (conrol click, or park on the clip, and Apple 9) and re-name them.
make a new bin, drag the timeline clips to the bin,
select the bin, and file menu: batch export.
[
www.lafcpug.org]
make self contained, use in/outs
this'll give you each track as it;s own file which you can bring into toast.
you're approach would be a lot easier