Hi OP,
I had a firm diagnosis of gestational diabetes with dc2 and dc3. Diet controlled in both pregnancies. I had a homebirth with baby number 2 and planned another with dc3, but ended up transferring in because of failure to progress. Had a normal birth once in hospital.
I was unable to get support for my homebirth from the community team and ended up employing an independent midwife. I hope that if you decide to go ahead with your homebirth you get good support.
One thing I would encourage you to do is buy some extra test sticks and start to really work on your diet. My second dc was 11lbs at birth, which resulted in a shoulder dystocia - was resolved fine and I was glad it had happened at home and not in hospital, but really didn't want to repeat the experience with baby number 3. With my second the gd was picked up late (I didn't see the dietician until week 35), by which time my ds was already very big. With my third baby I was given extra scans, which picked up that his head circumference and thigh length were longer than my second dc. I was determined not to end up with a 12 lb baby so did a lot of research into changes I could make to my diet which would bring my blood sugar levels under control.
From 32 weeks onwards I jettisoned pretty much all but a few handfuls of carbs a day from my diet. I ate lots and lots of green veg, olive oil, fish, lots of protein and nuts. Hardly any dairy (other than butter), and all refined carbs went. I allowed myself three small portions of slow release carbs in a day - oats, basmati rice and a slice of granary bread. Every meal with protein. No fruit juice. No bananas, limited fruit. Supplemented with half a teaspoon of cinnamon three times a day (cinnamon may be associated with increased risk of miscarriage in early pregnancy, but could not find any evidence of risk in third trimester - it reduces blood sugars)
Have to say - it wasn't fun, but when my son was born he weighed only 9lbs 3oz, the lightest off all three of my babies (my first was 9lbs 6oz), despite being the longest and having, by quite a long way, the biggest head circumference. He was skinny and long at birth, with very good tone and head control. Fed brilliantly. Now he's a wiry, super fit little boy of 6.
I've since discovered that the diet I made up for myself is pretty much the same that Gowri Mowtha recommends to mothers with GD on her 'Gentle Birth' method. here (she's a western trained obstetrician who uses ayurvedic techniques of birth preparation).
If you need more help and support you should contact the supervisor of midwives at your hospital.
You'll need to have some discussion around the subject of induction - which is pressed fairly firmly on mums with gd at around 40 weeks, because of the increased risk of stillbirth after this time with diabetic pregnancies. I found this very difficult to get information about - most of the research was difficult to extrapolate to my situation, as a non-obese mother with borderline diet controlled gestational diabetes.