Personally I am interested in bike locks myself and have tried developing something new on my own. The task is extremely difficult because:
1 Most people have no clue how physically aggressive a bike thief might be when steeling a bike. A professional bike thief will have the proper tools at hand and they know how to apply them. Most locks are good to let the occasional drunk take the next bike and not yours. Try to see this shocking video to get inspired: https://www.youtube.com/watch?v=VC3hFr8p2ck
2 The bike is thrown into a van and in a stress free environment such as a workshop far a way, with the proper tools, the lock is opened.
From your pictures, with the correct adjustment (very tight fit) a Vise Grip locking jaw plier will physically deform the surface of your nut (unless it is solid tungsten carbide or hardened steel) in such a way that the jaw pliers theeth plastically deform their teeth into your nut making a rock solid interlocking with your nut (this works because the teeth are very sharp and made out of hardened steel). In the 10" version you will have enough leverage to open the nut. These pliers work on 12.7 steel nuts and stainless steel 304 and 316. Such a locking plier is one of your last options when loosening a completly rounded bolt or nut before cutting everything off with an angle grinder.http://www.mytoolstore.com/american/w10wr.jpg
The 10 inch tool is an American made heavy duty piece of quality and not a small cheepish, Chinese copy.
Looking at your pictures I guess I could unwind such a nut within 10 seconds - unless there is something magic to your nuts which I cannot see from the pictures. If you have such a really big locking plier with unworn teeths, try to get at your nut and DON'T be easy on it. You need to be crazy brutal and aggressive - beacuse the bike thief will be.
PS: Did you know that thiefs carry lithium ion operated disc grinders in their backpacks? Such a disc grinder is a very very powerful powertool - it makes noise, but it will go through ANYTHING - even hardened steel. If a thief wants your front wheel he will simply cut off your fork ends with a disc grinder - it will be 5 seconds for each cut (2 cuts in total): He will walk away with your front wheel with the cut fork ends attached to your axle. At home in his workshop he will remove the rest.
You also assume that bike thiefs cannot carry all kinds of tools. Don't assume that. I assume they carry ALL tools.
I don't want to discourage you and be an ass, but this is my honest opinion.
To further inspire you: http://lock8.me/
which I believe has plenty of flaws.