Hoi Danny,
I must agree that i am not so sure anymore that it is from Celebes.
The blade fits perfect in the mouth, but it misses the style of a Bugis blade, so it could be it's a redressed Javanese blade.
I had bought this keris 15/20 years ago, and assuming that it was Bugis

,
if it is Javanese the only problem is to make the pesi back straight.
Thanks for your opinion Danny.
regards,
Ben