Routing ADTs from one IB to OB in multiple processes

5.6 on HPUX.

We’re moving to a new HIS and creating a new design for all HL7 interfaces.   We want to use a single site.  Unlike our old HIS, the new one will have a single inbound ADT that needs to go to about 20 systems.  Our current HIS sends about 5500 to 6000 ADTs a day.  That seems like too many threads to put in one process, plus I’d like to group the outbounds logically.  However, it my understanding that cross-process routing should be avoided.  It’s also my understanding we can have an OB thread that points to a port on our Cloverleaf box, and then set up an IB thread in a different process that uses the same port as a “pass through” and that avoids cross-process routing.  If that’s correct, do I configure the “pass through” OB and IB as documented in the data flow I’ve attached?  (I HAVE to use pictures).

TIA for the help.