You would actually get a better value by using a combo card instead of a card carrier as you would also be gaining back most of the ports lost from the IP406 chassis.
I know that in R6 when you reuse an VCM internal card of the IP400 using a legacy card, the number of channels of the VCM is multiplied by 3 and converted in IP Endpoints license. So my client have a VCM24 and making the upgrade we'll have 72 IP Endpoints. This was a huge saving because he have 65 IP Phones installed without license (in IP406 R5 there's no need to license the IP Phones).
I'm including a Combo Card to mantain the 406v2 control unit port as "hbsurfn" suggest.
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