Hi Arthur , I do use Sonarworks on my speakers and the mixes translate very well to other systems,
I do not use Sonarworks for my headphones , Morphit is much closer to my speaker eq.
I use Shure SRH840 headphones. I would expect Sonarworks to be closer but they are not.
These Headphones are not calibrated buy Sonarworks. That maybe an option for you is to buy
a calibrated set from them. In the mean time I would do a mix using Morphit and a mix using Sonarworks
and see which mix translates better to other systems , That is what counts ,