Hi
@vic's , and welcome to the forum!
The main problem with transplants is the lifelong need to take drugs to prevent the immune system from killing an organ that doesn't belong to your body. This means you're more at risk for infections, as you basically weaken your immune system.
Pancreas transplants have been done for years, but usually only in combination with a kidney. You die when your kidneys don't work, so you need that transplant to survive, even if that means having to take immunosuppressants for life.
If you need to take this medication anyway, it makes sense to add the pancreas as well.
I don't know much about those things, but let me tag
@Grant_Vicat , he knows all about it and is usually happy to tell his story