Well, I've looked at it. I was thinking something like macadamia oil with vitamin blend and whey protein. I'm sure you could get a robust blend of vegan oils with some work and invention, then of course synthetic sources come into play here. I don't think it's not feasible, and I guess there are a rare rare few people that have tried it for a while. Don't know much about that.
It would be interesting to run with it a vlckd and if and just see how far you could live, but there is more to life than this. Give me some oily fish any day, close enough.