this is currently not possible. What you can do, is to add a Toontrack HH and then use your samples to Stack on the separate HH articulations.
After that, you can select the original Stack Member and Mute it, selecting the entire Stack will of course Mute the whole Stack.
User samples can currently not be set to be members of a “Mute Group”, so an open HH sample will not be choked by a closed sample.
To work around that, you can Enable the Envelope for the Open sample Stack Member and set the Release to be triggered by Note Off.
