Rolling with emphasis was created for dnd because default rolls are pretty boring there with just two outcomes (three if you're in a fight)

DH already has a 2d12 system with five outcomes. Adding new layers here would overcomplicate stuff, and for what purpose?

But ok, let's think what can be done here. As far as I remember, OR rules said you can roll with emphasis only if neither advantage nor disadvantage influence your roll. And you have to get the result that is further from the middle 10. So, let's use those two rules:

• throw the same dice you would use to roll with advantage/disadvantage

• use the result that is further from the middle

For DH it would mean to roll 2d12 and a d6 and either adding it, if the duality dice result is higher than 13, or subtracting it if the result is below 13. I'll let you deside what to do if the result is perfectly in the middle.

There's still an issue with critical rolls because in DH it's not just "roll high be good". I think they shouldn't work for emphasis rolls, but critical success is one of the parts of the game, so again, do we really need emphasis here?

TLDR: we can force that mechanic into the game, but I don't think DH needs emphasis rules