"Even with 4b, if the number and location of distant mets is less than 5, that would be what is called oligometastatic (translated - a few mets) and some oncos like Mark Scholz say that may be curable if the distant mets can be radiated."

That was almost precisely my treatment at a major research cancer centre here in Canada for stage 4b (oligometastatic):

1. Emergency debulking surgery on the metastasised tumour (which had compressed my spinal cord and left me temporarily paraplegic).
2. Immediately started on ADT (Firmagon/Degarelix) and an androgen-reception inhibitor (Erleada/Apalutamide).
3. 5 rounds of SBRT radiation to the surgery site a few weeks later, when it had had time to heal.
4. 20 rounds of SBRT radiation to the prostate 6 months later.

Now I'm at 2½ years since diagnosis with no progression and undetectable PSA — I'm registered in the IRONMAN/TruNTH study, so I get a lot of extra blood work every three months and it's all in the green. While I have some side-effects from the hormone therapy and (much more) from the spinal-cord damage, over all, I feel better and more energetic than I did in the years before my cancer diagnosis.