Do you mean you would like to invert the individual gray scale strips?
It is not too difficult to make your own calibration page. Not only for single ink output but also ink mixes.There's a clever binary to color number system to find out what color qtr uses in callibration mode.
In the standard inkcallibration file the step tablet information is in the G channel and the channels R and B (only printers with extra orange and green) are regulating what ink is used for the ouput.
But if you just invert the scales in the G channel of the standard file you might be there allready.