Your 4x1 diseqc** could replace the 22Khz switch. FTA will select band via diseqc instead of 22khz. This would leave 2 ports unused. (could be run to dedicated fixed Ku dish/LNBFs) You'll need the splitters mentioned, so that the 922 supplies the operating voltage to the LNBs. But sends the L band i.f. to the switch(then FTA) and the 922. (Your 922 will also determine what polarity the FTA is on)
**The Spaun SAR411F may also be usable. I think it's a diseqc 2.0 switch
HD S2-I said that as more and more is going to h-264 (mpeg4) video and S2 for the savings in bandwidth, or much better picture quality in the same, or less, bandwidth (Yie, I can't 'clean up' that statement, hope it makes sense. [3rd attempt to simplify it])
HD S2 receiver of choice at this time is the GeosatPro microHD. (SatelliteAV - site sponsor)