You could Have SBRT, It works quite well. I know lots of people that have had it.

As mild as your case is you could also do focal therapy. Doing that would leave you open to doing radiation or surgery later if it comes back. The advantages, you usually don’t have incontinence or ED after focal therapy. You should at least look into it. Here is some real recent information about it.
https://howardwolinsky.substack.com/p/focal-therapy-in-the-spotlight-landmark
Here is the full UK article
https://www.sciencedirect.com/science/article/pii/S030228382602169X