I don't know if this is possible but why not let players keep the items they get and reset the levels. I find it to be a good solution. ( I mainly would like to keep my legendary gear from the iron banner that would effect the gameplay because it is cosmetic)
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I kind of understand, how some feel about the collected gear in the beta and how it would be nice for it to transfer to the finished product. How ever, this is the beta and the point of it is to help the developer to root out bugs, analyze network/ player behavior and such, not to please the testers whims (such as this one). The game is not finished at the moment and can have changes made before it's launch gear included. I for one think, that everything beta stays in the beta. Everyone starts fresh, when the finished game comes out on September. Fare and square.