An interesting tangent, with some interesting ideas. Naturally, with ST, there are as many ideas to fill in the cracks as there are fans, and I offer some, not to argue but as alternatives...
Magnum, I don't know if this is the other fan-made map intergrating SFB & ST but it does some of the same as yours but thought it might be
I also like the idea of the SFB races being absorbed/conquered/lost by the time TNG rolls around. Trying to intergrate SFB is tough, and the "divergent timelines" theory is a helpful work around - all the SFB races are "around" in "official" ST but not as big/powerful. For example, TAS had the Kzinti has a minor minor power with only police ships.
I'm pretty sure that Cole does, indeed, hate TNG et. al. and wouldn't touch it even if he could. Then again, I don't even think he likes Star Trek, just his own little version of it, but that's just my opinion.
The ST Star Chart published by Pocket did a pretty good job laying out the races that jive with this and Magnum's map but with a few differences, mainly that the Gorns are in the 6 o'clock position. I like that better, but I know that doesn't match the SFB/F&E layout; I just don't really use the Gorns myself
I came up with my own map, based on "my" alternate (Alternate alternate alternate?) timeline. A little sloppy, but I moved the Gorn down, turned the Cardassians a bit... Since this is a map of 3D space, some of the empires are "above," like the Tholians, Sheliak, Breen, and some "below," like the Deltan, Talarian, Trill.
I think the Son'a was actually pretty small, just the few planets they absorbed, and were closer to the Klingons. I included a "Kzinti" as per TAS (small, close to Earth, and the "Mirak" as a different race, as per the SFC descriptions.
One thing that did get "established" is that races can get around Local Space, even if there's no direct borders. There's a reference to the Cardassians being in contact with the Vulcans before Kirk's time, we saw Ferengis cross paths with Archer's Enterprise... the Nausicaans could be nomadic or far-ranging, like the Hirogen were in Voyager, so their home could be far away yet you find them everywhere.
I'd love to see a TOS-style Cardassian ship or two, just as a random thing to run into. Design-wise, what would a Cadassian look like if it had been built in 1969, by the TOS effects crew for the Fourth season we never saw.