If you are vegan for ethical reasons, then that's non-negotiable and more power to you.
If you are vegan for health reasons, then it could be worth looking into shifting to vegetarianism so you can get eggs and B12 etc.
I'm not trying to start any argument or pass any judgement here, it's just that vegan low-carb is relatively limited and difficult, so opening your options would be of benefit to you, if possible.
Great reply however I know a lot of vegan diabetics who've been living fine for the past 30 odd years. Like for most people there's always ups and downs with any diet. There's various food industries out there which have over stressed the importance of iron and b12.
The key point here is that you can have any diet as long as it's balanced. Of course supplements help, but this is sometimes convenience over not being Jamie Oliver meets a nutritionist!
I've not eaten eggs for 25 odd years or more. But it's wrong to think a vegan, keto diet is somehow lacking. The shame
I find is that most vegan restaurants and vege/vegan offerings are carb based food other than balanced. So, for the post initiator I empathise as it seems impossible now to eat. It's more education. I was in the same position. However, it took time to learn my way out of it and literally cook different country foods and discover new ingredients and cooking techniques.
Eating rocket, watercress alongside kidney beans, chickpeas and tofu is great and their application in modern Vietnamese, Southern India, Israel, Japan, Mexico to Ethiopia (but you change out the bread for lettuce) which are great, interesting and varied. The use of fruits and nuts really jazz up any cuisine and a great source of iron. Many can be batch made and this makes a whole working week of balanced food. Spanish food, especially summer gazpacho can be blended in with a tasteless silk tofu.
B12 is easy with supplements or using marmite in quantity during the course of a week in stews, fortifying mushrooms, and of course side dishing with crudo and peanut butter dip. Iron I take as a supplement during winter typically as lifestyle. But I can eat iron based foods but I prefer to eat more seasonal. Vegan summer foods are typically less heavy and to be honest very enjoyable so I drop the pills then
For me, the hardest part was where to find the information 30 years ago. With all the info out there it's now not wasting time.
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now off my meds and hba1c in non diabetic range since October. So pleased! 
