It’s always worth the trip to get better care and the Linac certainly is that.
But perhaps this weak stream issue should be addressed first? SBRT (cyberknife) even with gel spacers delivers high doses of radiation and the bladder can become inflamed, swell and cause decreased flow or blockage( happened to my friend who was given Finasteride and did fine). So the RO’s, while understandably concerned, don’t address the WHY of your situation.
Do you have BPH? Congenital bladder condition?
There are quite a few stories on this forum of men who had TURP’s or HOLEPS or Green Light Laser therapy PRIOR to any cancer treatment because of these pre-existing bladder conditions.
So before you make that trip, you might want to look into that; you DO have time as your biopsy shows intermediate grade cancer ( a few months, not years!) and urgency ( no pun intended) is not an issue. Best,
Phil