Miguel, thanks for all these diagrams and research. These gold hilts are indeed quite interesting and beautiful. However, from what i can see in the diagram you presented in post #15, these hilts clearly were not attached to the weapons that we consider to be kris today. Different types of weapons use different types of tangs for different reasons. Indonesian keris still use a round tang because it is a stabbing weapon, not the slashing weapon that the Moro kris developed into, so the stability that the rectangular tang offers along with the a sang-asang is not necessary. So i am not sure that we can use the evidence presented here to make a case for a evolution in these kalis forms from round to hexangular to square or rectangular tangs that we see in Moro kris since we are looking at completely different weapons.
It's fine to use the general terminology of "kalis" to describe all these weapons, but when you use the term in that way, all "Kris" might be "kalis", but clearly not all "kalis" are "kris".