We’re not intimate with Moab Juniper and Moab does not provide any support to Piezography. But, they describe it as a typical fine art baryta glossy paper.
So, you might try Hahnemuhle Photo Silk Baryta or the Hahnemuhle Photo Rag Baryta or the Hahnemuhle Fine Art Baryta curves and see if the results are acceptable to you.
We are not making custom Pro curves. Instead we released a curve making software system called Piezography Professional Edition Tools. For less than the cost of two K7 customs you can buy it. It includes all of the Master Curves required for making customs. You would print these targets and measure with one of the supported spectros (i1, Spyder, Munki) and use the software to generate the curve.
Also if you purchase the tools you can be part of the private Piezography Pro support forum. It’s a fantastic value!