I've done that with him before. It doesn't seem to work. At one time, I had a mixture of three foods. Then his brother died. I suddenly had bowls full of one of the mix. I finally realized that he was eating AROUND the one he didn't like, patiently, thoroughly. So ended up with two.

For my next cat, I will mix up a minimum of three foods, in case any brands or flavors leave the market. And then immediately add in another third one!