I've been reviewing this thread the last couple of days, and I had a thought: getting at the front (closest to the flywheel) 1/8" fitting normally requires the starter to come off. Why couldn't a flexible line be used there that had 1/8" fittings on both ends?
A quick Googling finds an $8.99 18" grease gun hose with 1/8 male NPT threads on each end. The line has a rating of 3000 psi, so I don't think we need to worry about our marinas' water pressure bursting it.
Yet it should be flexible enough to get into that fitting with the starter still in place, and the rest of the bushings, etc. could be fit to the other 1/8 male fitting on the end.
Unless someone can think of a good reason not to, I'm going to give this a try. I just acid flushed the engine -- and good golly, what a mass of goo came out of it -- and I wanted to do the pressure flush as well. This looks like a good workaround for removing the starter.