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Scratch my previous pessimism. After I get the temperature monitor installed I will hook up the battery pack at 48 volts and see if the controller can handle the lower voltage. If it can I would like to do some test runs at that voltage and see if the motors stay a more reasonable temperature.
If the controller doesn't like 48 volts then I'll source a cheap one and do the tests.
I can get the same top speed at 48 volts if I switch the freewheel sprocket to 35 teeth instead of 30. But I need to find out if the voltage drop will resolve the thermal issues.
Being at 48 volts will also make it easier to upgrade to a lithium pack later on.
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