Shortcuts to duplicate entities and geometry for symmetrical plr map

My many long years of sad experience have taught me not to do something twice when I can do it once and duplicate it. I am making a symmetrical plr map and I can duplicate and flip+rotate the geometry easily enough. But entities are a different story. I am specifically interested in path_tracks.

Each entity is named, however, and properly includes the label "red." It seems to me that I can use some sort of find/replace action to replace "red" with "blu." Seems easy enough, right? Is this possible?

Thanks