You might try some printmaking paper such as BFK Reeves. Very nice texture that will take pastels fairly well. It doesn't have much size in it, so I dry mount it to a rigid board before working on it with water.
Have you tried sanded papers? I really like painting with watercolors on the white sheets, followed up with pastels. Fisher 400 and UArt are going to hold up to the water better than the Pastel Premier papers. No softening of the adhesive or lifting of the grit which will happen with the Pastel Premier if you get it pretty wet. The UArt isn't available in white, but watercolors look nice on the buff colored sheets if you don't need white, and they are also very water resistant like the Fisher 400. I also do the same but with Dr. Martin's Bombay inks when I want a darker or more intense underpainting. Of course the sanded papers are not going to give you the absorbency of watercolor paper since they are pretty much waterproof, but sometimes that is actually a bonus because the paint stays on the surface and is more intense. The sanded paper can eat up your brushes, so don't use the $180 Kolinsky Sables!
Last edited by contumacious : 02-29-2020 at 06:27 AM.