Yeah, it's a bit late.
I would strongly suggest finishing this grow the way you started, Happy Frog, liquid nutes and all. Then, plan ahead with the organic route for the next grow and do it right.
Trying to switch up in the middle of a grow pretty much never works out well.
You know, you can recycle the mix you're using with organic amendments? There is no need to toss it when the grow is over, even after using liquid nutes. It's not ruined or anything.
MistaRasta and Richard Drysift both give excellent advice, listen to them.