Hi everyone. I'm abyssonym, I do some FF6 hacking and speedrunning.
Brossentia, I don't think that such an item could exist. The reason for this is because unlike BabaBreath, sketch is not a spell. It's hard coded into the battle system, and doesn't have a spell ID. You can see a list of spells and their corresponding items here:
http://www.tales-cless.org/docs/ff6hack.htm#magic . For example, "Black Belt" has the same ID as "engulf". Something I wonder is whether "sneeze" could be used in a similar way as BabaBreath.
As for Kutan strats, I've talked about it with LCC and he tends to think it's still worth it to get Celes, since she helps out against Number 024 and you can pick up some nice relics on the way to meet her. Also, Kutan dies very easily against espers and doesn't soak up damage as well as Celes. I would very much like for Kutan to become the standard though.