You could get away with using one of the returns as the emergency drain, in the herbie style the are used to pick up that slightly difference on top of being the emergency drain in case of a clog. Also make sure to use gate valve and be aware that they are not set and forget, you should periodically flush it by opening the valve completely and then adjusting it again.
You would probably be fine, but the true theory behind a Herbie or a bean overflow is that the emergency drain(s) can handle 100% of the flow in the event of a complete blockage of the min drain(s). If you only have one open channel(emergency), and are running at close to full capacity of your 2 main drains, there could still be a flood in the unlikely event of both drains plugging at the same time.
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