Good morning, Mark:
If you want the goods, you must pay the tariff. (The tariff here being, learning new things).
Here's the pragmatic answer: You need to spend as much time, talent, and treasure in order to pass the exam. No more, no less. The Exam Content Outline (ECO) for the current exam (changes this summer) states that about half of the exam is adaptive project management. For the "new" (July 2026) exam, that increases to about 60% according to the new ECO.
Just becuase you have to learn something, doesn't mean you have to do it at the day job.
Good luck