This is nonsense. Having a urethral catheter in situ for a few months will have no effect at all on your long term bladder control.
Your description of the referral system and tertiary management by the urology team is also fairly far off the mark.
If you are going ahead with the surgery (which I really hope you have researched better than these other areas) then make sure you can afford nappies for life.
I could come up with a better plan on the back of a fag packet in 10 minutes but I'm not going to promote self mutilation.