I'm also 3+4, so I tend to look at the world through that lens, but, unlike your pathology report, mine didn't show seminal vesicle involvement, positive surgical margins, and ECE.
The American Society for Radiation Oncology (ASTRO) and the American Urological Association (AUA) have published guidelines that suggest you may be a candidate for adjuvant radiotherapy, i.e., that you should go ahead with RT without waiting for a rise in PSA to 0.03 or some other trigger:
"Guideline Statement 2. Patients with adverse pathologic findings including seminal vesicle invasion, positive surgical margins, and extraprostatic extension should be informed that adjuvant radiotherapy, compared to radical prostatectomy only, reduces the risk of biochemical (PSA) recurrence, local recurrence, and clinical progression of cancer. They should also be informed that the impact of adjuvant radiotherapy on subsequent metastases and overall survival is less clear; one of two randomized controlled trials that addressed these outcomes indicated a benefit but the other trial did not demonstrate a benefit. However, the other trial was not powered to test the benefit regarding metastases and overall survival. (Clinical Principle)
"Guideline Statement 3. Physicians should offer adjuvant radiotherapy to patients with adverse pathologic findings at prostatectomy including seminal vesicle invasion, positive surgical margins, or extraprostatic extension because of demonstrated reductions in biochemical recurrence, local recurrence, and clinical progression. (Standard; Evidence Strength: Grade A)"
Grade A evidence strength means that the guideline statement is very well supported. If you want to see the documentation, it's here
I had a mental block on thinking of spread as an issue in the context of your Gleason 3+4 and PSA of 0.01 (at UCSF, your PSA would still read <0.015 and you'd be sitting pretty). But, if adjuvant radiation is appropriate, and you need time for your urinary tract to heal, the suggestion of getting started with ADT may be a good one both to prevent spread while you heal and to enhance the effectiveness of the radiation. The latter may be more important than the former. As always, the benefits and risks of each therapy have to be weighed.
I'm not sure how this fits in with your plan to spend four months in Czech. Perhaps it doesn't.
If I'm pointing you in the wrong direction, hopefully Tall Allen will come to the rescue.