Maybe Shortcuts will gain scheduled workflows in iOS 13. You can schedule an alarm or a reminder, but you can't attach a workflow to trigger at that time, as far as I can tell.
But since you mention a Mac: try digging through Doug's AppleScripts for iTunes;
he has an AirPlay tag.
Something like (not tested, and I don't know much about AppleScript)
Code:
tell application "iTunes"
set current AirPlay devices to AirPlay device “Turtles's iHome speaker”
set myPlaylist to playlist "Morning Songs"
play myPlaylist
end tell
The above (probably) won't actually work, but the result should be close to that.
Two things will help: digging through Doug's scripts some, and dragging the iTunes icon (hold cmd) onto Script Editor in order to dig through the iTunes scripting definitions.
With that, you should be able to get it working. Much harder if not impossible purely with iOS.