I have four handles in this style in my collection, one is very big (the one on the right), I really doubt the Palembang attribution and I believe they originate from West Java but this is just my feeling.
The base of this handle style would fit much better with a Javanese mendak as with a Palembang pendokok, look for example the keris from Jean, in my opinion it's a mismatch, sorry Jean!
Regards,
Detlef