I have a question about Dish Network's dual tuner receivers.

I know that if the correct switch is used, a Dish Pro Plus separator can be used to run both tuners of the receiver off of one RG6. I also know that a diplexer could be used to backfeed the modulated feed for the second TV into the existing wiring.

My question: Can I use a Dish Pro Plus separator and a diplexer together? What I want to do is place a dual tuner receiver in a location in which there is only one RG6 going there, and it is next to impossible to run another. I'd like to run both of the tuners off of the one RG6 using the Dish Pro Plus technology and then use that same RG6 to backfeed the output to the 2nd TV. Something like this: