The consistent pricing requirement was removed years ago. This is an article from 2011 about it: https://appleinsider.com/articles/11/06/09/apple_backs_down_...
0: https://lh3.googleusercontent.com/pw/ACtC-3dznQemACWzb2tbYfd...
> During a subscriber’s first year of service, you receive 70% of the subscription price at each billing cycle, minus applicable taxes. After a subscriber accumulates one year of paid service, your net revenue increases to 85% of the subscription price, minus applicable taxes.
Source: https://developer.apple.com/app-store/subscriptions/#revenue...
Though if you're forced to add in-app purchases and cannot advertise the other method it seems somewhat moot.