Need to have one ASM disk group ( PROD) mapped to two or more ASM disk groups (TEST, DEV)

I am in the process of planning migration from 10.2.0.4 non-RAC filesystem (san) to 10.2.0.4 RAC/ASM. We need to have more than one instance per on RAC nodes. We need to have one ASM disk group ( PROD) mapped to two or more ASM disk groups (TEST, DEV).

We need to use SAN based FLASH copy. Not RMAN cloning. Given there are more than one instances to be built, we need a way to rename disk group names from "old" to "new" after SAN sync is complete and before they are mounted to ASM instance. The reason is after SAN cloning is done – Disk group name (DG_PROD for ex) from production will be called (DG_PROD) on TEST instances and DEV instance and hence a conflict unless we can rename them to DG_TEST, DG_DEV and do control file rebuild.