As someone currently in kidney failure (not complete yet..but.yeah) who will be facing a transplant sometime in between 7-20 year (yes, this is the estimate they give me!)
I reccommend doing what lots of people in my position do. Lie.
Basically, being suicidal is the only real rule out and most doctors will actually fight /for/ you. The commissions just have it hard because there are so few donors and so many needed they need to prioritize. :/
I think thats only for non live donation though. If you have a friend or family member donating it's a lot easier.