I have used Rachaa Pueraria Mirifica Capsules 500mg as the powder for my mix with some success:
https://smile.amazon.com/gp/product/B07BLQ4MXG/
I take the powder out of the pull-apart capsules and grind it up, and mix it with a small amount of CeraVe cream:
https://smile.amazon.com/CeraVe-Moisturizing-Cream-Daily-Moisturizer/dp/B00TTD9BRC/
I let it sit for at least 5 minutes after mixing to make it combine.
You could use a bulk container of PM to go with the CeraVe and make your own cream pretty inexpensively.
I've found using PM cream on my hips and thighs works well, more so than on the chest. You can also order plastic beauty pants to apply the cream and then fall asleep keeping the cream in place.
PM is more ER-Beta agonist than ER-Alpha agonist. The simplest explanation is that you have more ER-Beta receptors in the lower half of the body, while the breast is primarily ER-Alpha receptors.
I tried using DMSO but it seems to toy with my heart rate and blood pressure more than I would like.