As someone who has taken both, but not at the same time, I really have to ask, why? The incidence of breast cancer in MTF transitionals is negligible, or at least it was a few years ago when I was doing my research before I started on pharmas. If you "gotta have them now", then you're probably someone who can accept that slight risk, and use pharmas. the risks are higher for other side effects, such as DVT. It seems to me that this study, (and it's 15+ years old), was geared to females?
If we can accept that pharmas, while truly risky, are indeed much more potent, then it follows that in order to introduce 10x the amount of estriol contained in PM, compared to an equivalent dose of estrogen, one would have to consume an enormous amount of PM? I can see no real reason to consider this mix. If, indeed anyone is, I would say, for the money you would spend on PM alone, you could buy 5x as much pharmas, (or more), and be set for a long time. My reasoning could be wrong, though, as I try to keep things simple.