Crawl in...
I also have an Oday 22 and have army-crawled head first down the port berth toward the stern. Not fun, but doable. Maybe I'm missing something here because you mentioned that there is some sort of custom fiberglass work that is making you crawl from the starboard side? My starboard cockpit has a lazarette, so is accessible from there. The port side is, as I mentioned, available by crawling headfirst. I had to do this when mounting a swim ladder on the transom. The port-side mount should seem easy enough to get to I would think. I've attached a photo...