Dan,
Welcome! Sorry your Dad is having problems but, we are with you! Pat yourself on the back as a caregiver to him. He is fortunate to have a caring son! I lost my Dad 10 years ago at age 88 and never regret the extra time and travel to visit him.
Your question on a cystoprostectomy. My gut reaction is that would be a suggestion that will be talked about at your appointment. At the same time I leave all of that to the healthcare professionals as they say, their pay grade is way above mine!. USC would be a good place to get further prognosis as his case has become "complicated". You want the best in this situation plus it would be almost like a second opinion.
Come back anytime with any questions. No subject is off limits and many times someone has been there and done that with help.