Welcome Beloved 66,
Whew. Seems like I have read about several with the same situation and questions lately!
Chemo/radiation is not a normal protocol especially if you have a neo bladder or Indiana pouch. Radiation can damage tissues that are usually needed for the diversion chosen. Chemo/surgery is pretty common.
Perhaps the biggest piece of advice over the years that most will tell you is to pick a surgeon that has does many (25-35+) a year of what you choose. Also, you are correct, many have long lives after this kind or surgery.
Here is a great link to copy and paste about pro's and cons on the 3 basic diversions:
my.clevelandclinic.org/health/treatments/12546-urinary-reconstruction--diversion
Ask away as you have other questions.