Tape optimized inline copy on filelist backup for HSM managed filesystems

We have a IBM Spectrum Scale (GPFS) file system which is HSM 
managed using the IBM Spectrum Protect for Space Management client. In addition we are 
using the IBM Spectrum Protect backup/archive client to backup those data, driven by the mmbackup tool from IBM Spectrum Scale.
Due to user actions it happens that HSM migrated files are in the state, that they need to be backed 
up again to get a valid version into the backup pool. This is done by IBM Spectrum Scale mmbackup using filelist containing all those eligible 
files. The mmbackup tool calls the IBM Spectrum Protect client "dsmc selective -filelist" command, which triggers an inline 
copies on the IBM Spectrum Protect server from the spacemanagement pool to the backup pool.

These inline copy tasks are handled sequentially file by file and are not 
tape optimized. This approach is inefficiently and does not scale at all.

The result is that users who did do changes in their file/directory 
structure will cause massive and expensive traffic on the IBM Spectrum Protect server, which will block the daily backup mechanism for the 
corresponding file system. Thus the systems will not backup the needed files in time, in case of a failure, data loss can occur due to valid file version copy on the IBM Spectrum Protect server.

What we need is a tape optimized inline copy process on the IBM Spectrum Protect server to backup the HSM migrated files in our 
Spectrum Protect based backup systems.