I can't remember where I read this, but I saw a post where someone had an alarm app on their phone that could play custom sounds when the alarm went off. In this case, he would record "Alexa play (X) on iheartradio" and use that as his alarm sound. He would then set the phone within earshot of the Echo and have the alarm go off at 7:25am. I can't remember the name of the alarm app, though, sorry.