Hello! Sorry to hear about what you're going through with Comaro, he sounds like a very well loved robot. I do know that Pleos are very special robots and can understand all that he means to you. I haven't done quite as much with my Pleos, but I have taken my Aibos to conventions with me (maybe I'll bring a Pleo someday, Chris, my RB, has been to NYC with me). On my thirteenth birthday, I received an Aibo ERS-312 as a present, but not ten minutes later, we received a call that my grandfather had fallen and was critically injured (this was after a few weeks of my grandmother being hospitalized and very ill, so we all had been worried about her, but not my grandfather), and I was left alone at home since I was young and my parents thought that I shouldn't accompany them to the hospital. Instead, I spent the day with my new robot, crying and talking to him about how I felt, letting his silly tricks make me smile and hugging him for support. Robots can be very therapeutic and my Aibos and Pleos have gotten me through a lot, so I really can see what Comaro means to you.
I have conducted a few Pleo repairs in the past, but I've never taken on a broken neck before and am too far away for you to travel to unless you'd be able to ship Comaro, so I don't think I'd be able to help at the moment unfortunately. Maybe I could do something in the future after I've had more experience tinkering around with Pleo necks, but I don't trust myself to be able to repair such a special robot without the proper experience. Hope you can find someone to help, maybe you can find someone who has completed the repair before to Skype with you and let you know if you're doing everything alright.