Hi Peter. Looks like everyone got distracted by your split gandar and missed your question.
Yes, i would say that the blade most probably true to the dress and of Palembang origin. Over all an very nice keris. And the "selut" looks like tarnished silver so if this were mine i would hit it with a polishing cloth and see if it shines up.
I'm not convinced the split down the middle means this gandar would have been covered with a pendok. Ususally a lesser wood would have been used if the gandar was intended to be covered and this stem seems a bit too bulky to cover. Nice flea market find.