Hi Ian,
You are looking for the origin of the Philippine kris and found similarities to the Bali keris blades in comparison with early Moro kris blades which are obvious. But it's always a good choice to look not only in one direction. Regarding the hilt form from the first from your shown kris and blade similarity I would recommend the following threads:
http://www.vikingsword.com/vb/showthread.php?t=27123
http://www.vikingsword.com/vb/showthread.php?t=23514
http://www.vikingsword.com/vb/showth...light=Warangan
Like said, it should be only a little bit food for thought.
Regards,
Detlef