Possibly, but the worst bits are under the boot floor where the pipe makes two sharp 90 degree bends, which wouldn't work so well with flexible hose because they'd collapse. Obviously I could reroute the pipework to take those bends out of the equation, but then there would be nowhere to clamp them in place and avoid them flapping around.
I also want to replace the whole lot anyway - I figure that if I'm chopping part of it out, I may as well just spend the extra time to replace the whole pipe from front to back.