Ok. So I'm not vegan. But I thought I would give this one a go.
The recipe I used was this one https://simpleveganblog.com/how-to-make-oat-milk/
Now I must say, home made oat milk tastes like wet oats. However! I think it could work with my smoothies, where I add honey and banana, yoghurt and sometimes peanut butter. I mainly drink milk in smoothies anyway, so I will give it a shot.