SUM - My signature is similar without the persistent PSA so far, sure makes the journey eventful
I assume by "saturation SRT" you are including the lymph nodes? Seems to be a reasonable plan if your signature means that none were sampled previously.
I am not so sure that the PSMA scan will help much with your low PSA and further suppression from the bicalutamide but if they are willing to do it, why not? Another MRI and/or CT scan would be worth a look after the post-op carnage.
I wish I had words of wisdom for you but no one is control of the cards they are dealt with prostate cancer and your followup plan looks solid. There is little more you can do at this point other than heal up. I did not find ART to cause many significant issues so it is just a time waster more than anything then you wait.
Good luck with your scans and ADT. The weather will be better soon.