I guess I really can't help but I have satellite channels through a set-top box. It's through DirecTV with their standard secure-card control box. From the box, I run composite cables to my PC's tuner card. (Hauppauge 2250) In that configuration, Windows Media Center is able to download DirecTV's schedule and I'm able to change channels on the Sat-box via an IR blaster cable that came with the tuner card.
I'm not familiar with the Sat-Cards but if they present audio and video to WMC like a TV tuner card, it would seem to me that WMC could be configured to show the signal. How WMC is configured is the question. WMC needs to know whether the signal is over-the-air (ATSC), Cable (includes free signals) or Satellite. I'm sure this is so WMC can configure the TV card. The card must be recognized by Windows to load drivers but if drivers are included with the Sat-card, surely there must be a way for WMC to show the A/V program. It may be that WMC could be configured using the Cable option, I don't know but that would be the direction I'd pursue.