On medication that can lower blood sugar, such as metformin, under 4 isn't considered a safe zone, it hypoglycaemic.
Why on earth would you be considering a pancreas transplant if the only medication youre taking is metformin so you patently are producing your own insulin. Putting a transplanted pancreas into you won't make you not be insulin resistant. It will mean undergoing a surgery with a 2% mortality risk and 8% risk of serious complications as well as immunosuppressants that significantly increase your risk of kidney damage and skin cancer.
Can you please share a link to wher you have seen bariatric surgery putting blood sugar to 1 or 3? Those are dangerously hypoglycaemic readings, not readings to be aspired to.