Here’s one way I think should work. I put together a quick test BP:
I’m using the “On Tick” Quartz quantization boundary, and setting the boundary multiplier to the result of the time delay (2.5 seconds in your example) divided by the output of Get Seconds Per Tick of the Quartz clock.
This seems to work but I don’t have an easy way to make sure it is sample-accurate. I think it’s at least a step in the right direction. Hope it helps! 