I’m afraid this already exists in the form of the Ambutech cane holster. But in general it’s not really something we need. It’s easy to keep track of your folding cane since it’s never far away. I’ve forgotten my guide dog more often than my cane.
As far as making a cane more pleasant to use, well... The use of a white cane is about practicality above all else. It’s designed to do a specific job that requires it to be the way it is. Things that make it more pleasant to use are not in the design but in the way you move the cane. It still has to be functional above all; it’s a tool and the tool itself isn’t what makes using it unpleasant, but the way people treat us for using it sure does.
If you can figure out how to make a telescoping cane that’s cheaper and more durable, that’s about the only white cane tech I know of that could use improvement.