The shower pan has removable access panels, at least mine does. I'm not sure how helpful that would be though. It seems I'd have a hard time working an arm in there.
My cord on my old Kiwi 17a would kink up and get stuck inside like yours once in a while. I had to remove the entire cable hatch to get it out. I couldn't get it unraveled from the access hatch.
2013 Jayco Jayfeather X20 E, 2008 GMC Sierra 1500 Crew Cab Z71 SLE