Using the Trigger Delay as the timeout is perfect.
I just added a bit here to calculate a 'good' delay time based on the FPS setting (might use Performance monitor to set this)
I didn't see any need for the Buffer actor.

To illustrate what the others are saying, here's a gif that shows how the Gate will only allow values through that while it is "on".

As Michel said, when you turn a Gate on, it does not automatically push a value from the input if that value is just static.