You can already schedule alarm in Sleep as Android using Tasker intents (not the plugin)… Sleep as Android implements the Android’s standard add alarm intent… use https://developer.android.com/reference/android/provider/AlarmClock AlarmClock.SET_ALARM with extra SKIP_UI… did that help?
Alarms created that way are “Delete after ringing” by default…
You cannot directly delete an alarm with an intent by you can turn an alarm off based on it’s label, see