I think you'll have to wire in a separate ignition and starter switch. The engine will only crank with your foot on the brake, which could be a problem if you've misjudged the traffic ahead and need the engine to crank immediately without loosing any more momentum.
Also yes, you have to go: Ignition Off> All Off> Restart. You can't simply go Ignition off> Ignition On> Bump Start. In fact you might not be able to do bump starts at all, because you might not be able to switch the ignition back on without also spinning up the starter motor.
The keyless system is likely a separate module and could probably be removed if you have the right software to sort out the CAN communication on the now missing module.
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