You can completely delete the aux water pump, the only disadvantage is that the flow of hot coolant to the heater core is fluctuating depending on the RPM of the engine water pump, so temperature with low RPM at idle and stop and go does down a bit.
The original pump makes 950 liters per hour.
You can also use a different pump like the one you show for Volkswagen and Audi, which is cheaper from the aftermarket, as long as the feed and discharge connections are same size as the original pump and the pump dimensions are similar to fit to the hose length. And you have to make some modifications to the pump bracket and the wire connection/plug. Also the capacity of these aftermarket or even Bosch pumps for VW is much lower than the Hella pump, if I remember right, it is about 250 l/h. But in general it will work.
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