Hi
My husband had a distal pancreatectomy with spleen removal 18 years ago. The splenectomy really hasn't resulted in any issues. There are several vaccines that were required that he have following the surgery. He now keeps an eye on his temperature if he gets a fever. Are they planning to do a dotatate pet scan? That will give you the whole picture and allow you to make an informed decision.
If at all possible, try to be treated by a net specialist. Canada's primary specialized multidisciplinary center for neuroendocrine tumors (NETs) is the Susan Leslie Clinic for Neuroendocrine Tumours at Sunnybrook Health Sciences Centre (Odette Cancer Centre) in Toronto, Ontario)
Also, it's great that your looking for guidance. It's also really important that you educate yourself as much as possible about this. Here's a great site for that:https://cnets.ca/