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Note that you cannot change the length of a timeline during play. Only in edit mode. So I'm not sure you can make a situation where the timeline magically changes length?
If you purely want to be able to set the length of a timeline in edit mode, and keep the playhead set to a specific time... you could use a timer in speed mode so that it won't play by itself. Set the target time to the length of the timeline manually. And set the current time to the time you want the timeline to be locked to. Then wire the timer's "timer output" into the playhead. That's the percentage of current time relative to the total time--same as what you want for the timeline.