How connect rfc servers in a HA environment?

Hello folks
We are setting up a HA installation consisting of a clustered DB/ASCS package and a bunch of non-HA dialog instances.
Now my question is, how do you connect 3rd party applications like for example business connectors, kofax topcall (a fax solution), archiving solutions from imtf or external job schedulers like $universe to that system.
They either connect to a gateway as registered server program or they act as rfc client connecting to the SAP system with user and password. Now i was explaining the concept of message server logon groups to everybody. The result in most cases is a confused smile.
I am afraid we end up configuring those tools to one single application server, which renders it a single point of failure.
Does anybody have a similar environment? Remember we have only a central services instanz without gateway and workprocesses. How did you solve this problem then?
Cheers Michael

Taken from the sample saprfc.ini from the original SAP rfc sdk.
Here is the saprfc.ini for client (we addidionally use a saprouter here):
/*===================================================================*/
/* Type B: R/3 system - load balancing feature                     */
/*===================================================================*/
DEST=MY_DEST
TYPE=B
R3NAME=SID
MSHOST=/H/saprouter/S/3299/H/mshost
GROUP=SPACE
RFC_TRACE=0
ABAP_DEBUG=0
USE_SAPGUI=0
We decided to add a standalone gateway on the SCS server for registered server programs. Here is the saprfc.ini for rfc servers (registering at a gateway):
/*===================================================================*/
/* Type R: Register a RFC server program at a SAP gateway          */
/*           or connect to an already registered RFC server program */
/*===================================================================*/
DEST=MY_DEST
TYPE=R
PROGID=MY_PROGRAM_ID
GWHOST=gwhost
GWSERV=sapgw0x
RFC_TRACE=0

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