So I looked into turning a bool #read column into a numeric #percentread column for use with Kobo Utilities. Ran into a few problems (e.g. how to handle in-progress fanfics, various problems when converting composite columns/saved searches) and decided to just stick with the bool.
I'm going to guess the answer is no, but is there a way at present (or easily added) to have Kobo Utilities set a bool column as "true" if the book is marked as finished on the Kobo?