@OP go with inflatable wedge pillows. you can change the hieght and firmness based upon how much air you put in them. Also easliy wipeable to clean. Deflate and they take up little room.
They're great. More support than a regular pillow but not as rigid as a foam wedge.
Not knowing exactly what you are looking for this may work.
Depending on the pump you can get an attachment that would work something like this.