So you want to replace your twin line callipers with single line?
Well the callipers are the same internally, your problem would come with the master cylinder as you would be having one side do all the work rather than it going half and half on the 2 circuits.
Currently the 2 circuits do the front primaries and the front secondaries/rears.
You would end up with the front primaries/secondaries on one and the rears on the other.
I wouldn't like to say how well that would work.