Of possibly importance: I have remained on version 3. It seems to cover my needs fine, and I really like the old interface

I usually work in folder view on converted DNG's, but I have always saved my original RAW-files (mainly CR2 + RW2). Recently I've imported my RAW's into PSU (keeping them in their separate folders) and added them to my DNG's as version sets.
I often rearrange and rename my DNG's (they are of the form (YYYY-nnn, meaning e.g 2015-001, 2015-002 and so on). Often I will add a photo, which for chronological reasons should be interpolated and necessitate a renumbering of the whole folder.
Now, I'd really like to automagically rename my corresponding RAW's so they match the naming of their DNG equivalents in the version sets. I can't simply use the renaming option, since I won't always have one RAW for each DNG, and I might even have RAW's, that aren't yet converted into DNG.
I do not need proper synch, as the DNG-folder is my main workspace, I only need one-way renaming from DNG to RAW.
Is that possible, and would that even need version sets? I have only put the images in version sets in order to match them, but "Catalog: By Date" achieves almost the same result.