How about instead of prompting to enable notifications, you leave a small banner or other unintrusive/non-annoying UI noting that they're off, which users can tap in order to learn more about how to reenable them?
For an app that prides itself on privacy, it's kind of crazy that you're making it so easy to accidentally blow it.
That would drive me nuts. I do not want a banner permanently on I cannot remove.
And before someone suggests it: If the banner can be removed, you’re back to having lots of complaints for users that did not realise they turned off notifications.