Safe way to terminate exposed electrical during remodel?
I would also do wire nuts with electrical tape if I knew who was working in the area and they were competent.
The boxes you put your wires into don't need to be mounted anywhere. They can just be hanging around. But yes I understand cost and driving to get the boxes and covers can be a nuisance.
I know some people like to wire nut the hot and neutral together. That way if somebody turned the breaker on by accident, they would short out and not electrocute anybody. Again that would be wire nut and tape...