Honestly, we're preparing for a UC. If we get harassed or bothered by anyone about it, we'll just say "We didn't make it in time". The only addition to what you had on hand would be that I will have a sterile lancet or three (not a bother since I currently have 400 of them in my cupboard!) on hand to test baby's blood sugar, and possibly some stashed colostrum if I can manage to pump any out before I go into labor in case the little one's sugar crashed. I have been researching diabetics who have had home births, but the stats just aren't there. It feels like every woman with any kind of diabetes ends up having a C-section. I'm still trying to find a good outcome for a diabetic who gets pregnant.
Eh, now you've got me hunting! I can't find anything on type 1 diabetes (type 2? No idea what you are, but either way I can't find it) and homebirth or unassisted birth. I can't find a whole lot of birth stories of diabetics in general. Don't know what that means. I found a couple where labour was super super fast and the baby was born intervention-free, and they just checked mom and baby for blood sugar issues and everything was great.
But from what I can gather... if your numbers are under control then for you there isn't a huge risk. I'm sure you know all the risks to baby as well, definitely far better then my 45 minutes of hunting would tell me. If you know what to do for a shoulder dystocia, as much as you can (which any freebirther should probably know), and i assume you'd know how to test/control blood sugars for you during labour and for baby when s/he is born then it doesn't seem like that huge a deal.