You've got to try what feels right for you at the moment and something inside you is telling you to try it so you should. It's totally ok to try things out and either go with them if they work or change them back again if they don't. I always tell myself that it's good to role model making mistakes and rethinking things through as they will need to do that throughout their lives

But I think the real issue regarding the night wakings is about getting rid of the night feeds, as others have suggested, by increasing their formula intake during the day. I think that separating them is unlikely to miraculously cure the night wakings iykwim. But it might I guess..
I've got experience with weaning off a dream feed by watering it down and it worked a treat for us!
Good luck with your plan for the next few nights.