I have two accounts and do trade skill work on both of them.
At some point in baking or fishing you will need one.
These knives stack to 20 and are NOT consumed during a combine.
The trivial level is only 76 and any character of mine that even looks
at a forge will get to a skill of 190 smithing.
So while I was at it I made 2 stacks of these, gave one stack to
a toon on the other account put the rest in the Common Bank.
With "Make All" in the trade skill container UI now
it makes sense to get it over with all at once rather than revisit
making a knife or two on every single character. IMHO.