Custom events in Simulink

I would need to create custom events in Simulink, because the add_exec_event_listener(blk,event,listener)has a serious limitation: every possible predefined event occurs once in each step.

I would like to create my own events in Simulink, which I can send based on specific logic. (E. x. on data change)

What have been tried so far:

I did create a Matlab system block to notify the listeners on data change, but I couldn’t catch the event.

I attached my attempt.