How to make Alarm tones longer than 40 seconds?

I like Alarms that last more than 40 seconds so I needn't listen to the same few bars over and over until I'm sick of them, and so I can wake to Grofe's complete first movement of Grand Canyon Suite.

I realize I can use any tune from my device's library of music as an Alarm, but that crude capability ignores the various purposes of songs in the library. If I use music from my library as an Alarm, then I have to listen to it often when I'm playing my music on shuffle which can be just annoying when listening to an Alarm as though it were simply music. The problem is the best normalization of volume for an Alarm for waking up in the morning is for the volume to ascend from 0db to 45db. The best normalization of volume for evening Alarms (like time to go to bed) is ascending from 0db to 60db. The best normalization of volume for daytime Alarms is ascending 0db to 89db (with exceptions). The best normalization of music when riding my bike or hiking while shuffling my music library is level 89db.

However, iTunes/iPhone prevents me submitting a RingTone/AlertTone longer than 40 seconds. 40 seconds just isn't enough.

I feel sure this is just an if-statement in a software module somewhere, and I'd be grateful if the next release of IOS would change the parameter from 40 seconds to 7200 which should suffice for the entire length of Beethoven's 9th Symphony.