First, welcome to the forum Dan!
When this would be my keris I would try to change the cheaply worked new mendak against an old and better one.
The wrongko I would try to polish or to give it a new polish with shellac since the wood seems to have a nice grain. The pendok I would try to bulging and than polish it. The complete keris will become a different appealing look.
Regards,
Detlef