Hi Colleen,
Thanks Colleen for your insights into our issue.
Exactly..that is our first proposal to the client but they didn't agree for it but discussions going on.
Parallely we are trying to show them the amount of work that would be involved in modifying the existing roles as there are nearly 20000 roles. So, we are preparing the root cause analysis and reports with all the role details.
Hopefully we should be able to convince the client 
Regards,
Madhu.