Looking for a bulletproof 100cc bike, any recommendations?

Okay so I’m looking to get my first bike, but I’m looking for something pretty specific. I Like things that are built to last that I could take exploring. I plan to do some light off-roading but for me most duel sport bikes are a bit too large. I like the design of Honda hero bikes but unfortunately I live in Canada and can’t get one here. Not a lot of second hand stuff in my area, I’ve searched everything in roughly 200km radius from where I live as that’s as far as I could go, the only thing close is a ‘71 Kawasaki g3 for about 300cad and would need a full restoration. I’m not going to be going over 100kph and I don’t really plan for highway driving, mostly just light trail and city road. I know that this is pretty specific of a request so it’s all good but if anyway had recommendations then that would really help me out in my search.