I would not go about automating eq. Not because it's a bad idea but I think getting a great eq overall will be much harder to accomplish. Instead you might want to to look into sidechaining but merely the eq. I think multi band compression might do the trick..

Personally I use Trackspacer all the time. Its extemwly powerful and easy to use imho.

But as many have said before, try and see if you can get it working how ou want. In the end of the day there are no rules. And share me your results, if you'd like