I really dunno if it will do anything drastic. Problem is with SP is I believe beta-sitosterol (the active part) is only really a fairly weak androgen receptor blocker (as I understand). So... it may work but... it will have a weaker and also less targeted affect than finasteride.
Equol always seemed the best internal treatment to me, but no-one can properly make the stuff lol
On another note, I think topical antiandrogens like Eucapil, CB-03-01, ASC-J9, RU58841 and all that are the way to go tbh - no sides, and results!