Type 3c is actually more common that simple T1. The commonest cause of 3c is gallstones, followed by alcohol, both as a cause of acute pancreatitis, then followed by chronic pancreatitis. As the usual course of chronic pancreatitis involves persistent pain, the majority of CP sufferers appear on the Pancreatitis Forum, that being their primary problem. That’s where the missing 3cs appear, with the diabetes a secondary problem. I’m on both forums, my CP is autoimmune, but I’d already scored as a T1 24 years before, but I have all the same problems as 3cs, because of the Creon affecting the speed of absorption of food. I’m not the only member on both forums, mind, but there are only two of us to my current knowledge, unless folk are hiding under different usernames.
Now NICE advice is treat all 3c patients with insulin without attempting to treat as T2s, which always fails, there is no reason for clinics to withhold pumps.
Obviously, pancreatectomy patients are automatically treated with insulin and Creon, and have access to pumps and CGMs, as are cystic fibrosis patients, who occur both on this forum, the pancreatitis forum, and the cystic fibrosis forums.