de-duping and merging our Contacts - issues with campaigns

Hi all,

We are de-duping and merging our Contacts database in CRMOD as best practice and will have one contact linked to Multiple Accounts after the merge. The issue we face is that you can only add a Contact into a Campaign once but we will have Contact associated to Multiple different Accounts so we need to be able to add a contact and the related Account information into one Campaign. Can you please advise how this can be done. We are about to start on the Merging process and link into Eloqua so require an urgent answer on this problem.