Changing of catalog stars to fit procedural stars is crazy idea. Catalog describes real stars taken from observation - why should I change them?
Because if you look at the above images, you can see that there is an abnormal high star density area in the part of the galaxy where our sun is located - like a giant globular cluster. Obviously if you reduce the number of catalog stars by deleting entries in the star catalog data file you will make many people unhappy includding myself and maybe yourself as well . So I wonder if you can create an algorithm that will reduce the luminosity of catalogue stars close to our sun by moving a slider for example, similar to the magnitude slider from the menu - but this slider will only affect catalogue stars - the closer to our sun the higher the reduction in magnitude/luminosity. Like a filtering mechanism.
The other option would be to modify the algorithm responsible for the generation of procedural stars, to match the star density close to our sun and extrapolate / predict the density at the rest of the galaxy using actual data or mathematical models. I suspect this is going to be much much harder if not impossible to do .
There is a debug feature I made to control star generation. Go to debug or edit mode and press Ctrl-End several times to reduce "max star level" to 1. Then increase star mag limit to 15-20, you can see a distribution of the most luminous stars (only 1 level of star oct-tree)
I will check this tomorrow - right now I am off to bed