This is not obvious from looking at your pump reservoir but there are only two good locations for return spouts. The return flows coming back to the pump have to enter the reservoir away from the internal intake port in the housing.
So one spot is right in the middle on the back, the other is over at the 8 o'clock position near the discharge fitting. You can move that spout location around the corner and come in from the side at the 8 o'clock position.
Use some very high temperature silver solder or brazing compound to make the attachment.
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