How to use 2 service accounts on Ps3?

Maybe this has already been answered somewhere but I have 2 service accounts on 1 ID, my wife's and mine. We both play at the same time and I'd like for both of us to be able to play on either PS3 or PC. I bought a PS3 copy, registered it to my character and that all went fine. Problem is there's no way to use my wife's character now on Ps3. I tried creating another user on my ps3, setting up a new PSN account and even buying a 2nd copy of ARR on ps3 but since it's considered 1 ID, it says that ID is already linked to a PSN account. Is there any way to get this thing to work? Is there any way to separate each service account into it's own ID?