Sounds like you got a good deal there Norm with the trailer load of 2 stroke motors.
If you are thinking of modifying Victa full crank bases to fit the Powertorque motors on Norm ,I have 10 good PT bases here and don't mind swapping for full crank bases up to you it may save time .
All these kickback problems with the PT ,I don't think it's starter design ,I took the blade plate off a standard PT then attempted to start the motor ,as usual the kickback was severe then I replaced the motor with the 460 with heavier boss but still no blade plate and motor has no kickback when starting.
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I removed a powertorque motor today and found an old complete alloy starter instead of the common plastic centre ,it's been a while since I've seen the old alloy starters.