Trust me, I've tried healing from a clone by using my main's target, it's a bad idea (especially if your main is tanking, which it usually is in this situation). You have to switch targets, wait for the target to get passed through server lag to your clone, and start healing before you switch back to your original target. This tends to lead to extremely hit-and-miss tanking and healing, which are two things you really don't want happening in any situation. And yes, passing mouseover to your clone via an addon is functionally impossible since targetting is protected in combat.
Best bet, just free up five keys somewhere, assign one to each group member, and make some modifier-laden healing macros.
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