Not too long ago I made something similar for the GMT trays with a slightly different layout.
One contains two dividers (3 spaces per cell, for my Combat Commander game) and another contains a single divider like yours but spaced at the 1/3rd mark for my War At Sea style games (long ship counters + small air strike counters).
I'll have to clean them up and upload them to probably the misc. game accessory entry since it doesn't look like I can add them to the GMT publisher page.
I just used yours also for my Combat Commander game and they work perfectly for merging cells with small unit counts... not sure why I didn't do this style too!
I recently created a 3 spaces per cell version based on Edmund Hon's two spaces per cell version. Here is an image:
I will try to upload the PDF to the game accessories folder. I like to print this on a full sheet removable label.