My thinking is ...
There's no way you could ever incorporate a Bean Animal into your setup as you have 2 boxes, and the original design is based on the amount of water in just 1 box
Is there any way you can redo the drain plumbing so the 2 'main drains' each go direct to the sump, and still have the 4th hole for an emerg ?
This would save you redoing your return line
I know it'll be a dialling nightmare, but once balanced, it shouldn't need much tuning
Then you could put 'high level' floats in your boxes to shut off your return pump in the event your emerg is beyond it's 'safe' level
I know mine is not the same setup, but I have a float a bit above my Herbie emerg so it shuts the pump down before the trim can get wet
And the float is never wet, so it should last forever
I hope some of this helps
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