Copy G000 to work for Molga 99

We have a requirement where we want to create a copy payroll schema G000 applicable for country grouping 08 and make it work for country grouping 99.

Basically we are using country grouping 99 but the requirement is that it should behave exactly like G000. Our proposed solution is to make copy of G000 and all its subschemas and make them available for Country grouping 99 and create enhancements in report RPCALCX0 for each of the functions used in G000. This is going to be a very lengthy process so we wanted to know if there is any other easier way of doing it and if not will this way be successful or will there be issues in this too.

Thanks in Advance

Best Regards,