Well, first off, a 4x4 multiswitch actually has inputs for two LNBs , not four.
(See the Switches Simplified FAQ for the basics)
For each of the two LNBs, it needs both Vertical and Horizontal polarity.
Normally, you'd get that from a dual-output LNB by signaling it with 13 or 18 volts, respectively.
What you suggested might work on paper.
It depends a lot on the receivers.
And on how complicated you want their setup to be.
I wouldn't go that way.
Normally, I wouldn't mix bandstacked and non-bandstacked technologies.
A less controversial approach in an all bandstacked setup, would be to use some sort of splitters, feeding diseqc switches.
I'm not one much for splitters, so for a very limited system, there is a powered switch that comes to mind.
Unfortunately, we're going even further into the land of the weird, now.
There is a Dish Network DP-34 switch.
I'll just give you
this thread for your reading pleasure.
We're way out on the fringe world, now.
It's not too late to turn back to the traditional path. -
Over the years of study on the subject, I've come up with quite a number of solutions for the switch & LNB question.
For most people, picking the right -one- is probably wise.
And for most, the traditional (non-bandstacked) gives more options for hardware (lnbs, switches, etc).
See the Switch FAQ for how to hook up eight LNBs to 4 (or more) receivers.
We don't document bandstacked technoloyg at all because it's not simple nor widespread, and not for beginners.
But, since you asked . . .
