QTR-Quadtone RIP

Hi guys,
Quick question. 
I am familiar with the split toning function of QTR, but what if you have a specific tone you're aiming for? I have a specific tone I have made using the Epson's ABW Horizontal and Vertical Axis, and I would like to use QTR for printing. The only thing I can think of is to print a step-wedge using my ABW settings, read it and create a QTR curve from it.
Any other way?
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