This may not be something anybody is super familiar with.  The original hack Final Fantasy C2 by Tomato is a loose retelling of Final Fantasy II.  Some may argue it's kind of a remix of Final Fantasy IV but with FFII characters.  I decided to post this, because, why not?  The two patches work together and it still has FFIV music anyway.  Although, if there was FFII music available, I'd give it a shot just to see how the music would be placed, and maybe it would mostly fit where it would need to go, or maybe not.  There are two versions: Version A uses FFIV enemies; Version B uses enhanced FFII enemies.  These patches are to be used with Final Fantasy IV (Japan) (Rev 1).

(Version A) (Version B)

Additionally, the Record Keeper Sprites Port by T92 can also be integrated into these two patches, which I have so kindly made available here.  I have kept the first two patches available for those who would prefer those sprites instead.

(Version A) (Version B)