bpgp is probably not needed anymore. It never was documented. it was originally used in the script add_slave_on_client to pull the bp.conf file to the master server and then used again to put the bp.conf file back. it is sad that symantec has removed it from the executables. I know it was a big security concern but it sure saved me a few times.
it would be interesting to restore bpgp from an earlier 6.0 backup and see if it still works on 6.5
I do not know of anything to replace it. However, some Guru's greater than I, have discovered how to do most any command. I think they utilize the theory of the notify stop/start scripts and modify it to a simpler function.