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If and when I add a winch, the winch will be driven off the MAIN battery. Perhaps the isolator I just got MIGHT be better for you. I would consider giving him a call and seeing what he says. You mentioned the batteries are bonded for winching though. From what Mike was saying THAT kind of amperage, winching (or for my case jumper cables), shouldn't be going through the BIC.
edit: unless its grounded to turn off but then your batteries wont be bonded.
Couldn't this be accomplished simply enough by connecting the positive leads from both batteries to a marine rotary switch? When turning to knob to the "1+2" position, that'd be pulling current from both batteries simultaneously, while avoiding pull via the BIC, wouldn't it?