I agree with the opinions stated by “ North of the border” and “gently”. As a lay person who had focal Brachytherapy that failed I agree that with your urologist that you are likely not a good candidate for focal therapy, brachytherapy or something like HIFU as none of them deal with metastasis related disease that more than likely would not show up on a biopsy.

One last thought: considering that you may be dealing with aggressive disease, you would do well to consider being treated at a nationally recognized center of excellence that has an excellent track record for experience, treatment and success. Here is the link to national cancer Institute recognized sites:
https://www.cancer.gov/research/infrastructure/cancer-centers
Good luck on your journey. We’re here for you.