I wish this forum software supported polls. It would be interesting to know how many SONAR users actually use instrument tracks versus separate MIDI/audio pairs. I remember that there was a lot of clamoring for simple instrument tracks back when SONAR did not offer that feature, but when it eventually came along it was met with yawns by most of us oldtimers.
Sorry to get off-topic, but it seems instrument tracks are far from "simple" due to the limitations they impose. To answer the original post, the answer is "yes". I do that sort of thing all the time. But I'd suggest switching to separate MIDI and audio tracks where the implementation will be clearer and, well, simpler. Especially if you're a Kontakt user, because eventually you're going to want to insert multiple instruments into a single Kontakt instance and route each to its own audio track.