Welcome gqkandrk,
Sorry for the reason to be here! You are doing all the right steps including the second opinion that should confirm and give peace of mind on what to do. I have not had to have a cystectomy but, hopefully someone that has skipped BCG will respond.
It does sound like you have ruled out BCG as your case showed multiple tumors and part of the ureter being invloved so I understand. Plus, you still have time to further analyze. I am copying a book mark many have saved with an excellent discussion of the different diversions. Just copy and paste into yur browser. One last comment. Most accept whatever they choose and be sure whoever does it, does many a year. Meaning a minimum of 25-35 a year and has been doing them a for a few years.
See:
my.clevelandclinic.org/health/treatments/12546-urinary-reconstruction--diversion