In answer to your questions, yes the Flex 5000A could be fully equipped with 2 rcvrs and the V/U module, however they discontinued it with the release of their 6000 series radio. For satellites I've used the FT736f, Ts2000 and ft847 and none compare to the ease of operation and rx quality of the Flex5000A, which is why I'm holding on to mine.
But you could do what I'm now doing which is to use another radio capable of V/U transmission on all modes as your uplink radio and use a 6000 series radio with inexpensive down converters for rx. I then built a USB relay controlled box that drives antenna switching relays. I found this to be much cheaper than the other alternative which is to buy DEMI transverters or possibly Elecraft. And you also end up with another really useful radio as a backup for HF and other purposes at less cost than the 2 DEMI transverters. I've used this arrangement before (minus the automated relay switching ) I got my tricked out Flex5000. At that time I used the TS2000 as uplink with a Flex 5000A for downlink wth converters and it worked great! Stay tuned for exciting articles by Ron Parsons, W5RKN, and Dave W0DHB in the AMSAT Journal about all this. What I'm doing is a spin off of their ideas and working with them.
73 Rick, W2JAZ