There is no such move, but I guess you meant db2. For Ruthless, I'd be okay with that, he doesn't even need it. But I think Vicious should keep it. His punishes and ability to convert meter into damage were bad before ex Ferra Toss.
But you're suggesting to make Sub's OH super negative just because Kitana is perhaps unable to punish it, even though many characters can punish it. You're Kitana, you'll be fine. You still get to take your turn, which seems fair to me. Lots of characters have safe OH starters.