Guess you get your locals from either, Sioux, IA; Columbus, OH; Charleston/Huntington, WV; Dayton, OH; Clarksburg- Weston, WV; or Charlottesville, VA. It looks like the SD Locals for those cities are on both 105 and 129, but I did not see any HD Locals for those areas.
I imagine with either an upgrade to programming and/or a commitment, they will probably do it. If they are willing to give you a dish for the extra programming, they should furnish the correct switch.
But I suspect the CSR will say you need a Dish 1000 with either a DPP Twin or a DP34; so that you can get the HD programming and your SD Locals off of 129.
I don't think they take a customers word for anything.
I'm confused.
You must be using a 942 for DVR and OTA-HD, and probably own it.