Backup to Local Tape from Windows Client

Just as I can have NetBackup manage a tape drive / robot connected to an NDMP client, is it possible to connect a tape drive / robot directly to a Windows client and have NetBackup discover and manage that tape drive / robot?

At the moment we're getting 43MB/s with this layout:

windows client -> 10gbps ethernet -> unix master server -> 4gbps fiber LTO5 library

In contrast, our NDMP jobs, which the tape drive / robot are directly connected to our NDMP devices, run anywhere from 70-110MB/s.  We'd love to see rates like those.

Thanks!