hello cicada
I have looked through all your posts for me
quite alot questions :)

first I want to give some notes for this pig head bead.
It is of a type of hongshan culture jadeware which you could find in some exhibitions but no official excavation example.

yes as you said 4 ears 4 eyes 4 snouts make 4 faces of pig dragon for 4 directions.

acctually I personally think it is more like a macehead or symbol of some kind of power rather than just wear.

below is some examples of the same kind.
some are from taiwan Zhendan collection

http://www.aurora.org.tw/

they have a lot of materpiece of ancient chinese jadeware.

R.M.