As one novice to another DrD, your questions are appreciated.
These are not a keris form i know all that much about, but i would assume that the jeweled hilt variety, while most easily recognizible, would not necessarily be common since the jewels are an obvious sign of wealth. I would imagine that Michaels third example is probably more common.
Is the ID of these keris based solely on the dress. To my eye the first 2 look to be at least Jawa influenced keris if not actually from there. Michaels third example is obviously Bugis and BluErf's is IDed as coming from Buton (Sulawesi) with a Banjarmasin hilt, so it is Bugis also. Was there much Keris forging in Banjarmasin and did they ever develop any particular blade forms that can be IDed as specifically Banjarmasin?