I agree, this is not a sumatran kris.
I don't understand the comment about the sharpness of the blade. Krises are thrusting weapons and although some blades are sharper than others the blades are not supposed to cut (as in a slashing weapon).
Handle and sheath are parts which are often replaced and blades are sometimes adapted to different cultural contexts.
It will be certainly ok to repair whatever you have ( and also turn the orientation of the handle which is wrong and add a suitable ring or mendak because it is missing, if the handle or ukiran has been glued needs to be loosened by means of heat because it is supposed to be friction mounted with some cloth or rope around the tang)
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