I know it is a bit late and with no recompense but arranging the lead lengths so that they cannot be plugged into the wrong battery port is the simplest solution and usually possible on most layouts, it also keeps the leads short as well.
Of course some esc's are self protected in the first place, may be worth the future proofing investment?
One saving grace, we have ALL done it at some point, if we are honest and for those that haven't, well done or very lucky!
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