Go for a maple neck + fretboard, mahogany body and ash top. Would have a similar eq overall to your mahogany guitar but with the added growl of ash. Go for bolt on or set neck. Neckthru would be too bright for what you're looking for.
If you think it would still be too bright, go for the same combination but with a rosewood or pau ferro fretboard instead to tame some of the highs.
All very theoretical, of course.