In my experience, sun salutations warm up a lot of muscles very nicely, but they don't stretch everything -- for example, they don't do much for hip rotation or shoulder opening. And they're not really brilliant for the sort of long, slow stretches you might want to do when you're cooling down after exercise.

However, if you're into yoga, it'd be possible to find poses that do stretch the bits that need stretching after your kettlebell routine, and then compose your own vinyasa (flow) sequence.

sun_salutation would be a good place to get ideas from a yoga perspective (or, if you'd like, I could post a heads-up over there asking people to come over here and chip in).