Since no one else answered, here's my .02 cents worth.
I have never tried that, but I don't see why you couldn't. Add your additional sound to a normal track and then you'll have to re-define the folder or track stack of your drum kit to include that new track. I would expect it to be very do-able.
The only caveat is if your new instrument preset comes pre-configured with a lot of helpers, such as: Inserts, Sends, Busses, etc. Eliminating any of those will change the sound.
My point is, that what you perceive as a single sound, can come with a lot of helpers, which add to the resources consumed by your Project.