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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Yep, I think this would be the best solution. Send out a notification on the 26/27th of beta saying to put any gear you want to keep into your bank and just transfer the bank across !