It's a shame you haven't had a nibble in all this time...
I'm no expert, but from what I've read, the receiver usually powers the motor to move the BUD, and keeps track of position by counting pulses from a magnet-driven reed switch.
Haven't seen any receivers with the ability to keep track of two dishes.
Any sort of manual switching seems fraught with problems.
. . . of course, I'd be happy to read how someone has managed this feat! - :up
Would this idea appeal to you . . . ?
Use one receiver for each dish. (possibly two 922's?)
East receiver runs the eastern dish.
West receiver runs the western dish.
That would work, and be easy.
Not sure if you'd be happy with the outcome.
Two possible alternatives:
- move the one dish north enough to see over all the trees
- blow up (or cut down) the trees as you see fit