Hi Lakhya,
RG1 register records all finished goods movement. This has nothing to do with the Export Type. Irrespective of the export you do, the RG1 will be updated whenever you do J1I5/J2I5/J2I6.
By the way, why is this peculiar requirement that RG1 should not get updated during Export under LOU/Bond?...
Best Regards
DS Rajan