I am trying to create a block showing the Z elevation of particular points.
It could be used on surveys, drawn in metres, or structures, drawn in millimetres.

In both cases the value returned needs to be in metres.

For objects drawn in metres its fine, I can just use the 'Position' variable and de-select X and Y.
I had hoped to use the same variable (in another attribute, controlling the two with visibility) for objects drawn in millimetres, but with a conversion factor to scale the value to metres.

The 'Position 1' object will allow applying a conversion, but there is only position options for X and Y

Does anyone know of any clever tricks?