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You are at no more risk of damaging your catalytic converter with a bump start vs. a keyed start with any modern fuel injected vehicle. There is potential for damage with a carbed vehicle if the motor is allowed to turn over without the ignition on since the fuel flows regardless, potentially doing exactly what you suggest. Serious indiscretions there are usually followed by a large bang!
It is however worth noting that frequent engine off operation may allow the converter to go below it's optimal operating temperature, rendering it less effective during the cool times.
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