For the money that adapters cost it's almost worth it to avoid the work. The way you are describing, you would have to buy new studs and the spacers, then do all the work to swap them out. When you're done you have a setup that probably isn't as durable as your original.
You can get a set of two billet aluminum spacers all over the net for $90 that will do exactly what you want to do, and they are engineered to give you the same durability as the stock setup. You can get them in the same bolt pattern, or you can get them as adapters to change the bolt pattern.
http://adaptitusa.com/