There was a fair bit of flicker left in the LRTimelapse version of the same RAW set. I spent hours trying to remove it. It did do a better job, but I don't think the extra time it took paid dividends.
The idea of selecting the sky is good, except that in this particular instance, I metered at the end for the city itself. I wanted to draw the attention away from the sky and down to the city as it came to life. I was able to easily do that in LRTimelapse and that part worked great!