If this doesn't work, how does DNSC install a dish at 61.5 on only one arm of the "Y" to receive 61.5? With no skew on the Dish500, the signals will be directed straignt to the lnb's. The signals will not cross, as in two different satellite positions. Both lnb's will read the same satellite position! Both positions on the "Y" are mirrior images. It doesn't matter which arm you use, it will be at the same satellite position, if there is no skew on the Dish500.
IT WILL WORK FINE.
Likewise, you can use a Dish500 with two legacy dual lnb's for DirecTV, if you only need 101 degrees for four receivers. No multiswitch would be needed.