Where a Weeping of one species chooses a feat belonging to another species, how much does the flavour of that feat still remain intact?

The "Weeping-ified" version of the species feat was intended to manifest in a similar manner to the appropriate species, with all the strange and potentially unsettling ramifications of that. For example- A Fathach-feat weeping finds that their flesh reacts well to suturing, to the point that it can be riveted and "Repaired" like armour. 

Additionally, though the soul of the a Vartach-feat character may have a destiny, a physical brand will not manifest itself.