Yes, you should be able to achieve something similar in Dorico, but it’ll be a little bit indirect. You would need to edit the hi-hat instrument such that it has mappings for your tip and shank playback techniques. Then you can create a percussion kit and add as many different hi-hat instruments as you have degrees of openness provided by your playback device.
I don’t know how BFD handles this, whether you have separate patches for each degree of openness running on separate channels, or an entirely separate instance of BFD for each degree of openness, or whether you can access all of the different sounds using MIDI controller values or different pitches within a single percussion map. That will influence how you actually persuade Dorico to play the sounds.
Assuming it uses a different pitch for each sound, so e.g. closed tip and half-closed tip are different notes within the same patch, then in fact what you’ll need to do is create individual playback techniques for each combination, e.g. “closed tip”, “closed shank”, “3/4 closed tip”, “3/4 closed shank”, “1/2 closed tip”, “1/2 closed shank” etc., and assign all of those to the hi-hat instrument.
Then in your percussion map you need to assign “closed tip” to (say) note 36, “closed shank” to note 37, “3/4 closed tip” to note 38, etc., as specified by the BFD documentation.
But perhaps BFD works a completely different way to this. How do you select between the different degrees of openness in BFD?