What you could do also is combine either the 2 ports from the primestar or the 2 ports from the DBS and the 2 outputs from the KU LNB on the motorized into a 4x4 switch. In the above case I would do the Primestar and the KU from the motorized. Then the 2nd setup doesnt need any diseqc switches.
receiver 1-------motor----diseqc switch
port 1 0k side----KU motorized
port 1 22k side---primestar
port 2---DBS side
receiver 2 would have a straight shot to the multiswitch for both KU & Primestar
then you would have 2 extra ports on the diseqc switch and 2 extra ports for the multiswitch if you add other receivers