My friend, who is in his seventies, is G 3+4=7, has been on AS for five years. He has regular PSA tests, annual MRI scans and appointments with his consultant.
I suggest you do the same, at least for a year, then review the situation. In the meantime have as many orgasms as possible, as they might not be achievable once any kind of radical treatment starts.
Best of luck.
Cheers, John.