Overlay realtime ontop of historic data

Good morning,

A client has posed the following problem for their perspective project:
They want the ability to load 2 hours of data from 2 weeks ago and plot that data on a trend, then overlay the real time pens to see if the current trends follow historic data. We have been trying this with power charts but it doesn't seem possible without two charts, one above the other. XYChart is a possibility with 2 x-axis's, one being real time (date time) and the other as elapsed time (seconds), but this requires substantial work to script a positive user interaction.

I wanted to reach out and see if anyone has experience with this scenario and some recommendations on avenues to go down.