I don't really think Bloodrazor Vi would work out at all, no matter what arrangement of Masteries you had. The item itself doesn't really synergise with her kit or what she's aiming to achieve. She's much better off with Warrior and looking to explode key targets, ideally alongside a dive buddy, but she's perfectly capable of just flat out murdering squishies alone.
While you might have been able to make a somewhat valid case for building Devourer, its much harder to justify a Bloodrazor imo.