The fear with uncontrolled GD is that the baby will grow very big, but this is not likely to happen if your GD is well controlled.
My only advice is to avoid induction if possible - induction has a much higher risk of a c-section and brings with it lots of other potential difficulties.
Also, don't necessarily rely on ultrasounds to estimate the size of the baby - they aren't that accurate.
My children were 4.2, 3.8 and 4.7kg. No diabetes. The 4.7 could have been a challenge, but I had a planned homebirth with two midwives, one of whom was extremely experienced in that setting, and was excellent... and no stitches with any of my births! - just to say, it's possible to birth quite large babies without complications. My SIL had *UNcontrolled GD* and had a 5kg baby (fourth, the middle two were twins with a combined weight of 7kg).... and bled heavily with a lot of trouble, refused a blood transfusion because she was in shock (afterwards she actually said that in her 'right' mind she would have taken their offer of an infusion)....
Not sure what else to ask - certainly your choice of doctor or midwife will make a big difference in your odds of being 'encouraged' to accept an induction or a c-section. Personally, I had my three children all with midwife care (birthing centre, transferred to main delivery area for epidurals twice, third one homebirth unmedicated)....
Just stick to your healthy eating plan and try to focus on staying as healthy and positive as you can.
Oh, and another thing, some mums I know online express a little colostrum before the birth. One of the problems of GD is if the baby's blood sugar drops rapidly, they will possibly recommend formula. To avoid that it's possible to express the colostrum, which will give some nutrition - and definitely try to avoid being separated from the baby, and put the baby to the breast lots of times in the first few days - it will help your milk come in faster and keep your baby healthy...