Hi Ferrante, yes this is the system.
But I should take two shots because the first shot doesn't read the delay, (I wrote about this in an old message).
For this reason I wrote a personal patch (I compile kstars from source).
I added a new tab in the Ekos options with an option that must be activated to have the delay also on the first shot, but it has a problem: it can only be used for what I need, that is, to add the delay to the first shot, because if used with normal capture from the second shot doubles the set delay
I'm not an super expert programmer in life I drive ambulances, but he does what I want well.
Sorry for my poor English I translated from google.