FWIW, I'm also interested in using SD3 with ALK2.
I was able to load SD3 into an instrument track and fully trigger all the drums and cymbals in the Ayotte kit with my Akai keyboard.
Loading a MIDI groove from inside the plugin, all of the drums seem to sound fine. I cycled through some of the different kits and presets and don't seem to have any issues yet.
I'm just starting out with ALK2, but I do plan on using SD3 for backing tracks. I'll get back in this thread if I have any problems with it.
So maybe this could be