Not all roads lead to Rome, i think, but many do.
When i read that someone uses a shock collar I must say that I feel petty for the dog that suffers from that. I can imagine very well that it works, that you get the effect you want but what is the price? Your dog must experience pain in order to learn his lesson. I doubt that he is very grateful for that.
Of course we must establish ourselves as the leaders but I think there are better ways of doing so.
I would train walking the dog at home, in the most comfortable surrounding. My dog must walk by my side and nowhere else (at least if he shows bad behaviour). As soon as this works well at home, I would go out and do exactly the same. Every bark should be ignored and every calm situation should be praised. If the barking gets worse i would stop. So your dog sees that there is no more walking as long as he is barking. I am absolutely sure that no shock collar is necessary for this. Maybe it works faster with it but I am sure that your dog is worth living without the pain and the fear of it.

Please just consider working without shock collars and similar painful stuff!

Thank you

All the best

Michael