Can you have surgery (tummy tuck, lipo) with an A1c of 8.2? Glyceria basal is normal and otherwise healthy

No, I would not recommend any elective surgery with hemoglobin A1C of 8. You need to get your blood sugars under better control. Surgery is stress, and blood sugars may elevate with stress. Too high sugars interfere with healing, increase your chances of infections and dead tissue, and poor results.

In my experience, I have found that patients do their very
best by having their diabetes controlled as best as possible. Generally, this would represent an A1c less
than 8.2. That being said, I would defer
to your endocrinologist as to what the tightest glucose control you are able to
obtain. I wish you the best of luck.

An HA1C of 8.2 is high for a tummy tuck.  It would predict wound failure, flap necrosis,  and dehiscence, the most devastating complications in tummy tuck.  The only thing that would be worse is smoking.