I think RBaid has it right on the money. An easy to access cable lock that’s only there when you need it. Doesn’t require you to buy a new specific bike, etc. That’s a very now solution.
I also like the net solution. That would be such a pain to try to cut through. As long as the closure is extremely secure then I think that’s also a very viable idea. You’d just need a good way of carrying a cable net since I’d imagine it would be kind of stiff and thus, bulky.
Also this solution is good since people don’t always try to steal the whole bike. They’ll take anything on a quick release just because they can so something that just wraps up the whole bike is a nice idea.