Some interesting perspectives Boedhi and I'm particularly interested in your elaborations on certain keris parts/attributes like the peksi, ganga, tikel alis, tilam upih etc. Apparantly we're also along the same line in this respect at another forum which barely have progressed but perhaps you could also help in expanding the list and fill more. I guess there are further resources (brains) here to draw (pick) on too.
http://www.kampungnet.com.sg/modules...hread&tid=1395
I'd agree the peksi represents the phallus and the ganja the female part and as a unit may be a representation of the Shiva lingam. If so, I'd say this is a representation of the absolute, call it God of you like for Shiva is the destroyer and the destroyer transcends duality represented by mergence of the male/female, positive/negative attributes. Brahma is more associated with birth, hence my reasoning opposite to that of yours since it's not Brahma oriented if indeed so. At this juncture, I'd say it's still a conjecture on my part.
Here's an example of the shiva lingam.