Ian, as Alan has stated, i am not familiar with the "arrowhead" feature in Javanese or Balinese keris. But the feature might be a development based upon the gula milir, grooves that run up along either side of the sogokan and generally terminate somewhere around mid-blade or higher.
BTW, i don't think the gold/brass hilt on your first example is of Balinese origin. You don't find Jawa Demam style hilts in Bali. It is a rare type of Moro hilt.
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