The torque on the the gears will be the same, true. But the force from the higher thrust at lower speed will be resolved in the lower unit bearings. And the motor mounts. I don't design lower units, but I have a suspicion that this is something you can get away with for a time. Or at least get home and then tear down a LU and put new bearings in it. I suspect the gear teeth will be fine.
Just a guess.
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