jenniferd, unfortunately, stopping the scratching won't solve your kitty's discomfort. I understand it will stop the sores that are getting infected, but he will still be suffering.
Itching of the head and neck are very often an indication of a food allergy.
And he will be suffering from being declawed. Scratching and grooming are actually very important to a cat's physical health. And cats walk on their toes. Declawing the cat causes him to walk un-naturally, and it often leads to other physical problems - especially later in life, in the form of arthritis or leg and back problems which are very painful to the cat. Cats that are declawed often stop using the litter box. 85% of the cats that are given up to shelters by their owners for behavior problems are kitties that were declawed and have stopped using the litter box. I doubt you want to trade his scratching problem for a peeing problem.
Because he's scratching around his neck, I'd buy a tube sock, cut it into sections, and pull it down over his neck:
Our kitty had surgery she couldn't be allowed to scratch:
So we used the tube sock:
It's much better than the collar.
However, declawing your kitty to stop his scratching is EXACTLY like cutting off your fingertipes (or toe-tips) at the first joint to prevent your scratching poison ivy. It is not like having your fingernail and toenails removed - it would be the equivalent of removing your fingers at the joint.
It is possible that your kitty has developed allergies. The best way to determine whether it is allergies or not is to switch your kitty's food.
Royal Canin is a very high quality food, and your vet may be able to order the appropriate food for your kitty's problem: http://www.royalcanin.us/vetdiet/vetdietfelineind.html
You can also call Royal Canin to see if their hypoallergenic food is acceptable for a cat on a diet for urinary tract health: http://www.royalcanin.us/vetdiet/fel...llergenic.html
This is definitely an appropriate food for a kitty with allergies that are causing itching of the head and neck.
Hope this information and these suggestions help you solve your kitty's long term problem, and also help with the short-term problem,