Yeah, there's something like that for Android just called RPG XP, but it's not very good. It works, for the most part, but it's prone to bugs. This seems like it's made by the same people, but for VX/Ace on the iOS. I'd be weary.
I don't know how to feel about distributing a decrypter here. A lot of people here wouldn't be too happy about the idea of their projects being poked into. Wouldn't there be a way for the converter to decrypt then re-encrypt the project during conversion instead?