I made some hexagonal bits that will work with the bellows of the concertina held in the "hands" of the egg doll.
I actually unofficially call the egg dolls "blob dolls,"* not sure why. Maybe I just prefer blobs.
*UPDATED HERE TO SAY: I looked around online and I guess a "blob doll" might already be somebody's official thing. Of course! Why wouldn't it be? We love blobs. Anyway, my "blobby egg doll," I guess, is still in progress.