I've had pretty good results doing something similar with PM and SP and have been using minoxidyl for about a year.

I also try to have a cup of spearmint tea in the evening to lower overall T levels, though I'm not as good at remembering to do that.

I also have been washing my hair with Ketoconazole shampoo, Nizoral brand. It supposedly reduces DHT at the scalp level. Really it just dries out the natural oil almost completely, it's mainly marketed as a dandruff shampoo, but I guess the natural oil has DHT in it. You are going to want to use a lot of conditioner if you try it.