I'd say remove the one side and extend the tank for your overflow needs, or drill the tank and make some kind of internal or external overflow. If the tank breaks from the surge you're obviously using too much surge, there's no way corals will like that much water movement, not to mention the sand and rock structure.
You're making this more complicated than it needs to be, you're using a sump so you don't need an AIO, all you need is an overflow and there are plenty of ways to do that within the rules.
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