Free Transform with Smart Objects - Relative position

I have a smart object, it's one of two positions of a sprite so I need to move it precisely.

Workflow: Place object, position it (visually). Duplicate it, transform it exacty 290px Y.

OK, so far so simple.

Problem is, the relative (Delta) position in the Options Bar reflects the original position of the object (ie if I moved it 2px left and 151px up the Delta position starts at -2px and -151px) rather than the desired 0 X 0 Y, so I've got no way, without maths to move it exactly 290px Y.

Now this doesn't matter for me as I can understand this and do the maths but I have to pass the template to an artworker with instructions, (move it 290px down). And it will (has) led to confusion and complicated instructions.

If I rasterize the layer, it resets the co-ordinates but I lose the advantages of a Smart Object

Is there a way to set the position of the Smart Object to 0 0 (and presumably 100% 100% scale too)?