Honestly, the wholesale removal of hired assassins was a mistake IMHO. It was imbalanced, but making intrigue plot only reduces player agency in the process to an annoying degree, and makes assassinations of people outside your realm almost impossible, even when they border you.
IMO, they should have added a cooldown to be assassinate button, along with a minimum plot strength to fire it of around 50%, and a reduced chance of success compared to a plot that fires on its own.
Oddly, I asked a Dev in the rule thread if they would consider exactly this.
Nah, cooldowns are not fun. Better make it an event chain, like duelling and seduction. And make it exclusive to intrigue focus.
I want a decision if I'm trying to kill someone, not a chain of events with MTTH.
Assassins should not be as difficult to find as they are in the game currently. It's called the "second oldest profession" for a reason.