Hi Kai,
The blade looks like a javanese
patrem with it's thin and longer ganja.
It looks as though it was reshaped from a longer piece. The pamor lines
does not flow with the luks.
(I have a javanese patrem, of a different form. See
here).
The blade and the
sandang walikat sheath form looks complementary to each other.
In your assembly, the hilt and
pendokok (hilt cup) looks a little 'out of place'.
Without the longer 'neck' of the pendokok, the hilt would probably would not
fit the entire length of the peksi. The hulu and pendokok is of the Sulawesi (Celebes) form.
I have a short Sulawesi keris with a mini
tebeng-styled sheath. See it
here.
(The sheath is complementary to the form. But don't follow my pendokok

. Wrong styled. Mine is a peninsular styled pendokok.)
Nevertheless, should you decide to change the sheath, I would recommend a tebeng-styled sheath or another Sulawesi form (see
here).
Feel free to disagree.