One needs to ask. Why does that hose need replacing? I assume it goes to the shower sump then overboard. Unless you have a damaged hose that is leaking you may be creating a large project with no real gain.
Sterlau. You ever have any luck with this? I had to do some work to the fwd head which was not easy and I saw no way without cutting holes to get access to that drain hose. Even replacing the shower fixture I saw no way to really do that without cutting.