Is it possible to Change the value of a timeline keyframe out of the timeline?

As the title states, i am wanting to know if you can alter the value of a timeline key frame out of the timeline itself.

I think it’s best for everyone if i didn’t explain why as its quite complicated, but basically i need multiple timelines to run after each other depending on the last key frame from the previous timeline.
Hope anyone can point me in the correct location, i can try and provide a little more information if necessary but i don’t think it would help much.

Shameless bump, still really could use some help with this.

As far as I know the answer is no.