It looks like /r/vegetarianketo recommends TVP: http://en.wikipedia.org/wiki/Textured_vegetable_protein (I had some non-keto veggie lasagna made with TVP a few months ago, and I thought it was delicious).

Also, allegedly oysters are okay to eat?

> Oysters are generally considered to be fair play on most vegetarian and vegan lists of acceptable foods. They lack a central nervous system, can’t feel pain, are renewably farmable, and are a delicious seafood that is bursting with all sorts of nutrients.

http://www.slate.com/articles/life/food/2010/04/consider_the...