Are you attempting to make a new kind of suspension? O.o I think I get it but not sure? I think that what you are saying is that the double knuckle spindle attachment to the original double wishbone set up is what you are looking for? To replace the rear toe arms? I think the idea is far fetched at best. How will there be any point of adjustment to rear toe? Not like most cars with the set up use it, but still an option as it can go out of alignment over time as persay replacing your wishbone assembly rear? Also two knuckles and spindles?? How would that attach to a central wheel hub? Via another connection point equalling more complexity and wear and tear and cost of production of said such item? It doesn't seem to be likely or make much sense? Do I have the idea so far/answered the question?

Also say for this set up you are looking into an accident occurs, and slightly bends the frame of the set up, and with say a little bit of adjustment on rear toe it would fix it albeit be jank. Since there be no longer any rear toe is the car just permanently out of alignment/dog walking on the road?