You can. Some high temp plasters carry grog or chammote. This gives a texture to the clay, maybe you don´t want that.
Lower temp clays will do, a standard for sculpting since very long ago. You should find that without problems if you can find high temp ones. The cheapest one (SiO2, usually red) will do perfect, there are others that are grey etc. but the red one is ok.
The main difference between WED and normal pottery water based clay is that WED substitutes water for glycerine or similar, so it doesn´t dry out. Also WED might have more plasticity when working with it. But the main difference you must take in account is that with normal water based pottery clay you must take care of it so it doesn´t dry by pulverizing water on it every time you stop working with it and covering it with plastic to preserve moisture. This can be tricky as there will be sculpting stages when you will want the surface to harden a little, for example for detailing. So there you must control how much you wet it, or not. Sometimes you will have to leave it uncovered etc. WIll depend on the room temp too. Summer will not be the same as winter.
All in all, this kind of clay has been used for sculpting for a very, very long time.
Also you will have to take care not using too thin section or sculpting very small things as it dries out or cracks (due to drying) more easily.