If you link the trigger which activates the advisor for the script to a UI button/buttons the player is likely to press then you can make the advisor pop up which should work as a reminder.
Only thing I played much that is scripted is Arthurian TW, they did it with multiple triggers so more or less anything you selected in the campaign map made the advisor pop up with the start script prompt.
eg:
;------------------------------------------

Trigger ATW_Campaign_Trigger1
WhenToTest ButtonPressed

Condition ButtonPressed faction_button

AdviceThread ATW_Campaign_Thread 1
and also same thing for
Condition ButtonPressed construction_button
Condition ButtonPressed recruitment_button
WhenToTest SettlementSelected
which covers most things you're likely to select during your turn, and the advisor keeps coming up with those buttons / selections until you actually start the script.