Now that is a great idea!
One thing I've noticed with mine though is as the notes go too low or too high it no longer sounds right; so by recording the entire melody first, and exporting that as a wav, that would probably help a lot. Another thing I was thinking of was to create the track using the sampled notes and then replace with the actual VSTI's at the end. Either way, it sounds like we have some options when dealing with VSTI freezes.