Unless I misunderstood, it is easy. Just run this job step to rebind all packages in a collection:
//BATCHDSN EXEC PGM=IKJEFT1B,PARM=’DSN S(DB2P)’
//SYSTSPRT DD SYSOUT=*
//SYSPRINT DD SYSOUT=*
//SYSTSIN DD *
The first * means “all packages”, the second “all versions” within this collection. In fact, you can replace collection by * as well to rebind everything in the subsystem.
Of course, with every rebind you have to be aware of the possibility of access path changes.
You can probably do this from DB2I 5:BIND/REBIND/FREE as well, however I never use this; a batch job provides better documentation.