Whats wrong with the LC suspension? Just put decent coilovers and some ARB's on the V6 and it'll handle pretty much the same as an LCR with those mods. OK there's a bit more weight up front from the V6, but don't forget there's slightly more weight at the back too, so it still should be pretty well balenced.
By your own logic, the LC suspension is pretty poor.
You say the LCR handles like a barge, but you'd have to perform expensive modifications to get the LC to handle as well as the LCR. So by following your logic and theory, the LC must be pretty poor.
Now go and add a load of extra weight over the front end of it and you have made things even worse!