I could not find a cat food can in Kroger or Walmart that fit the bottom nicely so I use a SPAM can upside down. It has a slight taper on the bottom, which fits the concave portion of the Heineken can perfectly. Yes, I put everything but the windscreen inside the can.
I might try using it as a chimney stove. Just never wanted to carry a stand and it has been plenty efficient for me. FYI, slower burning stoves are more efficient (to a point). 7-9 minutes seems to be about the sweet spot for efficiency.
FWIW, if someone is using a tall, skinny pot that is NOT a beer can, I would not use a super cat. You still get lots of heat transfer from the supposedly wasted flames going up the sides. It's the very thin AL wall that allows that. Using Ti or thicker walls will result in much more wasted heat.