OK, so here's my attempt to insert The Triangle into the more canon map. It's oriented at 90 degrees to the regular map (so turn it 90 degrees left to "fit" it in).
I took the black/white pencil map from the FASA books and inverted it. I added Nimbus III (Star Trek V - Paradise City) into the region, since I found a couple of references placing it there. I then added a couple of surrounding planets/nebula from the main map for orientation purposes, and pointed at major areas off-map with big arrows. Finally, I made all the stars into coloured circles rather than white dots. It's not great, but it does the trick.
I'd rather it was hexes like the others, but I had no easy way to remove the existing square grid.