I've found several that change the frame size, but that does not address the issue of altering unit size based on raid size.
What exactly is the point of modifying the frame size based on raid size? The only reason I can think of (and I'm admittedly far from an expert...just a long-time add-on nerd) is in case you use it to parent a kgpanel to? I'm just curious what purpose it serves.
I did find
GridDynamicZoneSwitch which would theoretically serve at least my purposes, but it has been abandoned according to its wowace page. Also found
GridConfigurableLayouts but this looks to provide a far deeper level of functionality than I personally am looking for.