Sure, from a Keris perspective the current "hilt configuration" is completely wrong. But assumed
this Keris has been modified by a person with an European background for personal use, all those modifications make sense. The backwards facing hilt allows slashes and cuts with the convex curve of the blade. And the the wooden piece between the original hilt provides a secure european sabre like grip. The conical shape prevents the hand from slipping over the blade during powerful trusts.
The thing, how offensive it may look to a keris collector, has a historic context like Gustav has pointed out. And this makes it interesting for me

But good to hear that the keris-blade itself has some uncommon features, make it even more interesting
And i am also happy to anounce that the modification have been very gently to the original keris. Nothing seems to be filed off, neither from the blade nor from the sheath.
Anyway, i'm still struggling getting the hilt off using the candle-method described by Alan in another thread. Assessing my progress so far this may take quite a while...
Best Regards,
Thilo