I used to make small batches in the blender with no difficulty at all. I would advise temping very cool, definitely don't discount the water, and be super careful when removing the lid so you don't get a trapped air bubble spraying soap at you.
However for some reason I stopped, well it was years ago and I don't ever make small enough batches now. Also, I get such a fast trace from the stick blender than I can't be bothered cleaning the blender!