AFIR one was taught to climb to 500 ft then make a (left) turn and continue climbing till at 1000 ft, ready for a downwind leg at circuit height.
That's all fine in a slow (climbing) aircraft. But if your aircraft is capable of climbing to 1000' less than 1000m after commencing its take-off roll, it means that if you turn crosswind at 500', you do so a little further than halfway down the runway, and end up joining downwind about mid-field. Possibly cutting off slower (climbing) aircraft.
Personally I would expect traffic to turn crosswind not earlier than the end of the runway, and perhaps not earlier than about half a mile on upwind.