How can I secure an outward door swing to be safe inside without drilling holes?
I saw a device that looked much like a key hole in a steel plate. It slipped over the doorknob and it’s weight held it in place. I thought that was a good idea, even made out of 1/2” plywood if there was a few inches above and below it would be as strong as most cheap lock sets.
The keyhole looked like it was made with 2 different sized hole saws one that was larger than the handle and one just slightly larger than the shaft if you pulled on the door it did not move much. That would be something that could be made but I have not seen a commercial one.