Mine have converted lash whips from a venomthrope. I read the codex entry and completely missed where it said "One". However in the case of lash whips, 1 whip does the same effect as 20 and only a single scything talon has no special rules -- so in my case it doesn't affect
wysiwyg at all.
now the case of a bonesword is another issue entirely - I have no clue if it is a typo, and should say 'boneswords". Going by strict
RAW i would just convert 1 scything talon to a bonesword and leave the other alone. Or give a single (or pair

) of lash whips...but not a bonesword AND a lash whip, because that is taking more than "one" of the following...