Hey, that's one possibility I didn't look at, thanks
It would make sense if the "public face" has nothing to do with the "esoteric face". However, I still have a hard time imagining the a Tuban-Majapahit tilam upih keris with udan mas pamor, having a slender build, and radiating a dainty aura (or pasikutan demes), back in its time it was being dressed wearing a fearsome raksasha hilt. It's kind of like eating rye bread with guacamole sauce and bumbu pecel
Perhaps I am conditioned to today's norms in which such blades would be nicely dressed in ukiran Yudawinatan and warangka Ladrang, thereby supporting the overall dainty theme. However, the above arrangement is definitely post-Islamic. While my sartorial taste totally favors the more recent keris fashion style, I am still yet to find an explanation regarding the relationship between a keris and its ukiran during the sepuh era.