There is a fourth option for the rear cable where you keep the current connector tip (no cutting or soldering), but you run it towards the taillights inside of the hatchback (inside the aluminum frame) and back up (between the frame and the plastic trim). There is plenty of room for the connector tip and more than enough slack in the cable. You just need something semi-flexible to feed it down and back up (I used a 3-ft long unused zip tie I had laying around) like a glow rod.
I didn't want to drill any holes or cut the cable, so I tried the "short cut" method of going direct from the right-side "jump" straight to the top center of the window, but could not get the connector to fit through the openings in the aluminum. After an hour, I changed strategy and went for the "down and back" option, which I learned about here on the forum.
I will be in Des Moines for a family event in June. With enough advanced notice, I could carve out some time and help you with the back camera option, if you want, but with the right tools/items and some patience, I think you can do it yourself.
Good luck!