Thanks for sharing! I have the same bike. I haven't noticed coolant leaks but I haven't been looking. I will from now on. Really concerning but I hope you get it sorted out. Looking forward to your update. Btw, greetings from Japan!
Sounds to me like you're in the unfortunate situation of dealing with a poor quality part design, and a dealer which seems not to be up to standard. Question is, would dealing with the age-related problems of a 20+year old Honda Helix be less headache? I remember the videos it was in, it did seem like a very nice machine.