I communicated with both the outboard maker ("Don't exceed 55 volts. Seriously. Warranty is void if you do."), and the battery folks ("Battery is within specs, will try to find a solution, [e.g.: voltage regulator, buck converter, etc.]" but after talking to their tech as he searched, it doesn't appear that any off-the-shelf item which doesn't cost heaps of money has the right voltage and amperage range. (Matt: many thanks for the info and offer to talk to them. I didn't really dig into the details with them (cell voltage protection, etc.), but they didn't give me any runaround, and I think they did their best to be helpful.)
So... unless I can find a reasonable alternative, I'll go to plan B: Since this outboard can use 24, 36 or 48 volts, I'll rewire the batteries in parallel to make a 24 volt bank, rewire solar panels to output 24 volts, and buy a new 24 volt charger. My solar controller is also multi-voltage. This will, I imagine, reduce the maximum power of the outboard, but realistically I don't think I'll be unhappy with the speed from 24 volts if I every have to floor it. :)
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