I say use what works for you (or what appears to work in this case).

I ask a question though....

Don't you think that Fuji, Kodak and Agfa would have come out with a blix for films if it were possible in a reliable fashion? It would be a big selling point, eliminating one step and a few extra bottles. But, they have not. There must be some reason, right? Well, there you are. I know the reasons and I know how to get around them. All I can do is suggest that you see the patent on this subject. I've referred to it and given the # so many times I should remember it, but I do not. That gives as much explanation as is usual in a patent.