Problem opening standby DB following RMAN duplicate for standby from active database when using ASM

When using this method to create the standby, all files are copied to directories in ASM where the path is based upon the DB_UNIQUE_NAME, while aliases to the original path are only created for the non-OMF files. This results in failure when the standby DB is attempted to be opened as any OMF based files are not found.
For example,

Given:

DB_NAME = proddb
DB_UNIQUE_NAME = proddbstndby

Files are created on the standby by the RMAN duplicate for standby... process here:

+dgroup1/proddbstndby/datafile/

ASM aliases to the non-OMF files are created here:

+dgroup1/proddb/datafile/*


Starting the standby errors when an OMF file is attempted to be opened and the file (or an alias to the file) cannot be found in the path +dgroup1/proddb/datafile/