Sai,
whetehr the prop is on the same side of the motor as the firewall or on the opposite side does not change the motor from a pusher to a tractor. That has more to do with what direction the prop is pointed and which way it's spinning than which side the shaft comes out of.
While I can appriciate you wanting to move the protruding portion of the shaft from one side of the motor to the other, for most motors this is a difficult task. It usually involves a good vice/press and pin punch to press the shaft out of and back into it's berrings. After you've accomplished all that, sometimes you'll *still* fail because there aren't grooves on both sides for the retaining clips to be reinstalled after reversing -- You can't *always* reverse the shaft!
So what *can* you do? Learn to work around it. This motor has an optional bolt-on adaptor (as seen in the second, third and fourth picture -- those aren't "swapped" shafts) that will work splendidly on a pusher or tractor mount, so long as you can allow the shaft to pass through the firewall without binding. if you can't pass the long shaft through, a dremel with a cutoff wheel will make the longer shaft into a short one.
Again whether the motor is pushing or pulling (tractor) depends on which way the prop is pointing, and what direction it spins. You can always reverse the direction a brushless motor spins and flip the prop to trade between the air blowing toward or away from the motor.