Combine Retimes is a python script that can combines a stack of multiple retiming nodes into a single output (both a lookup table and a speed value).It supports any combination of Retime, TimeWarp, Kronos, OFlow, TimeOffset and FrameHold.
In addition, it also supports Switch and Dissolve nodes in the stack, although because of its nature take the later with a pinch of salt.
This script does not require installation and can be executed directly from the Nuke's Script Editor.
Download from Nukepedia (link)
Changelog: