I'm in the thinking stage of figuring out what I want to do with mine on my 20SF. In theory that would work but I'd be worried about the evacuation pump getting all nasty and clogged from fish scales, poop, goo, etc. Good strainer before the outtake might help with that.
I found this diagram from classic mako, but it doesn't seem like it would work well with my 20SF, doesn't seem like it would drain.