Well, it seems that all the methods that exist are too complex for my client.
I am preparting an automated TV Schedule Line-Up screen, where the client (tv station) can add up to 4 titles/times of the shows and then hit render to see it all in action.
My solution looks like this:
All the layers are locked, the sliders are constrained in vertical position and limited on left and right with
linear expression. You need to manually adjust the red marker to the end of the text, but I guess this is the simplest solution.
(The sliders on the right are linked to dynamic text and change hour and minute of the show)
Once the project is complete I may put a case study on www.imagonewmedia.com.
Thanks for all the effort, I am glad to see there is no solution (rather than that I overlooked something) :)