I'm trying to work from Lightroom to do a timelapse.
Couple things I've done:
I found a 24fps (plugin? whatever it's called) for LR that is selected in the slideshow tab, came from a British man's website. Works well for rendering the video but takes quite a while to render with large images (hours). I have PhotoshopCC but don't use it at all for TL.
If starting from jpegs I'll often use Startrails to create an avi, framerate and resolution are limited but not horribly so.
Framerate and deflickering can be done with Virtualdub. I also use FreeMake to change video formats (avi, mp4). In fact, on those rare occasions I take video with my DSLR, I use FreeMake to convert the file to something usable.
I used to be quite anal about using large, full resolution frames....but find that much smaller, lower resolution frames do quite well, although it's good to have the raws for astro.
Note that I do this for my own pleasure only, if you're considering commercial work you'll likely need more professional (i.e., expensive) software. If the workflow you describe is strictly for your own pleasure......it sure seems like a LOT of work and time.
I post timelapses at youtube\emagowan, if yer so inclined feel free to ask me about any of them. Most of my astro timelapses were done from raws with LR. I did one (I admit, a stupid one, but hey, the weather was truly crappy!) of my cat sleeping, one with flicker and the other deflickered in Virtualdub.