I wonder if Python could achieve a similar result?

 Python or Javascript, shouldn't have any problem with this.
Just restart a timer when a new value arrives, and have a pulsed trigger that has the time checked constantly, making updates as needed.

I would love a Value Delay that has a time input. So you could specify how long you want the changes in values to delay for. I made one once that really was too complicated, involving 2 values that control the x and y of a small dot generated in a Shapes actor, the resulting video is fed through a Video Delay into an Eyes, which outputs the 2 values as x and y of the dot. It worked ok, but was quite resource-heavy. I wonder if Python could achieve a similar result?

I've added delay to data before in this situation using the Data Array actor.

Funny isn't it - sometimes the simple ones catch you out.