It seems like one should be able to do this (note 4x red lines where you'd block things off, and 1x blue arrow showing a change of direction from the original diagram):
But in practice some of those spots are hard to block off reliably. I think where the stupid double metal pipe enters the side it's actually a female opening on the head, right? But maybe a cut down version of the stock fitting, and then cap it off an inch or two later.