Mudra and asana in/on keris hilts.

[Mickey the Finn]

It's primarily (but not exclusively) Balinese hilts depicting a figure in asana which I'd like to gain some understanding of. "Mudras of India" by Carroll & Carroll (ISBN 978 1 84819 109 9) provides some insight. I'm aware of a few titles dealing with the topic of Balinese keris, but I don't know if any would treat the subject of asana and mudra as found on figural danganan in enough depth to justify the outlay. Balinese figural hilts seem to depict a very limited number of asana (when an asana is, in fact, depicted on a Balinese figural hilt). Who (social status/ profession/ occupation/ calling) uses what hilt-asana and when/ where? Are the figural hilt-asana codified to be used only with certain, specific dapur, by certain people, at certain times, in certain circumstances? If anyone could provide an exhaustively detailed, thesis-grade response, or a more-or-less gentle push or shove in the direction of a pertinent post or link here or elsewhere [in English, Bahasa Indo, Finnish, Estonian, most any of the Indo-European "centum" languages, or Sundanese, Malay, or Javanese written in or transliterated into Roman letters], I'd appreciate it. (I have done the preliminary homework of searching for "mudra" and "asana" using the forum's search function). Thank you in advance.