As long as you can kind a single kick, meaning no cymbals or other instruments on a stereo recording, yeah you could do that. I once found a VH snare sample for a client who wanted a bit of that tone added to his. Takes a bit of time to give the sample a natural sounding tail, and of course you can change it's pitch after sampled, within SS Trigger. The end result did not sound just like Alex, but it gave a certain quality that the client was happy with.
Here is a pic of the Instrument Editor. All you do is record a wav of your sample, import in in a slot, then save it to SS Trigger. Simple stuff. Then it is there for selection whenever you want it.