Kind of a simple idea but definitely a quality of life one. If you are the sponsor of a Holy Order, notify you when they're available to be hired in a war you're currently engaged.
Reason why? If someone else hires them, and you can't afford the Piety Cost to yoink them away, chances are you'll never actually get to use it. The AI is very prompt at smashing that Hire Holy Order button like they ARE getting a notice that they're available to hire as soon as a war actually ends. Meaning you end up in a lot of wars you could have called them into, and always missing the very small window of opportunity because you don't get notices when they're available, or when random vassal or fellow religion kingdom happens to have ended their war.
Reason why? If someone else hires them, and you can't afford the Piety Cost to yoink them away, chances are you'll never actually get to use it. The AI is very prompt at smashing that Hire Holy Order button like they ARE getting a notice that they're available to hire as soon as a war actually ends. Meaning you end up in a lot of wars you could have called them into, and always missing the very small window of opportunity because you don't get notices when they're available, or when random vassal or fellow religion kingdom happens to have ended their war.