I don't see any way to automate this, as it sounds like you need to take a "measurement" of each line. There is no way for Revu to "auto measure" a line, and even if there were, Revu wouldn't know which line you needed to measure.
You mention unflattening markups. Are there already markups in existence then that you want to unflatten? If when flattened they were set to "unrecoverable" there is not much you can do.
I don't see any way to speed this up. Sorry.