Correct, all that set up is going to do is give the water an alternative route. Some water is still going to want to go to the existing shower head. However, if it's one of those leaks that require a certain amount of pressure in order to leak, then maybe that would take enough of the pressure off that it would work! But that's a maybe.
Tackling it from the back as you suggested would be the best way to go, if possible!
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