Alright, probably gonna confuse ya', but here goes.
You can use:
Legacy LNB & switches on DPP, DP, & Legacy rcvr's
DP LNB's & switches on DP & DPP rcvr's, lnb's, & switches
DPP LNB's & switches on DPP & DP rcvr's
So, for your 942, 811, & 4700 to be pointed at 110, 119, & 61.5, you will need 3 legacy dual's, a legacy 64sw & 2 dishes (It has to be legacy equipment because of the 4700). You will need 2 lines from the 64sw to the 942, and 1 line apiece to the 811 and 4700.
With your 4700 model rcvr deactivated, I doubt your installer will be paid to hook that up, so don't expect him to deal with it. He could use just a DPPLNB and a DP dual with 2 dishes, and only one line to your 811, and one to your 942 (where it could be seperated.)