^Funny, I was going to do something similar for a full Sabine Wren costume/statue, with removable helmet... So I figured I would get an "adult companion doll" head off of Aliexpress, thinking it would be more realistic than something made of plastic or whatever. Turns out the stuff they're made of is a nightmare. It gets dirty if you walk near it, it stains from colored fabric in minutes, and at only 100 degrees F it can start to deform. Also, despite staining easily you can't paint it with anything, it just flakes off. Absolutely ridiculous material. In the bin with that one.
So...how about some details on the construction?