Similar to the feature on Al-Fajr clocks, you should be able to setup an alarm before or after the Athan. Prayer alarm are useful for Iqama or prayer time. Each prayer alarm could be set to ring before or after the Athan time by a fixed interval.
Example: To set Asr prayer alarm to always ring after the azan by 10 minutes, or alarm before Fajr by 10 minutes.