Thanks for the post. I would recommend you to download the sample and look at the options available. This is a great question and its interesting workflow.
What I know is limited how notification works in iOS. In many of notification and alert-based frameworks, haptics are traditionally tightly coupled with the system sound behavior by default. If AlertConfiguration and its related configuration chain do not explicitly expose a property to mute, decouple, or customize the haptics independently of the AlertSound, there is no hidden workaround to disable them.
Filing a Feedback Assistant request is exactly the right next step for an enhancement request. Your specific use case of building a "gentle wake-up alarm" is a perfect justification for why developers need granular control over haptics versus audio. I haven’t got to explore the idea of adding different audio files to see the behavior. I would recommend you to do that as well as make sure on the testing device you disable all user preference on anything besides sound.
Feel free to drop the FB number here once you have it filed!
If you have any questions about filing a bug report, take a look at
Bug Reporting: How and Why?
Resources:
https://developer.apple.com/documentation/AlarmKit
https://developer.apple.com/documentation/AlarmKit/scheduling-an-alarm-with-alarmkit
Albert
Worldwide Developer Relations.