Gotta be 7 to ride alone at our mt. Six and under get paired with a random adult. I have mixed feelings about this. Most adults aren't really prepared. But, many have had kids so...
If you do get on with a little kid, going to the load line you can hold their wrist. Or not. Sone kids are highly competent. They'll tell you. Stay close anyway. At the load line, don't attempt to use the wrist hold method to get them on. It's awkward and near impossible. I like to do a reverse arm scoop. You can grab their knee or just be near it, then use your arm to push them on. Push the knees on if necessary. It's much easier, stronger and safer the backwards arm scoop way. Your poles are a bit of an issue. Figure out how to keep them out of the way.
Most little kids don't come anywhere near the back of the chair. Not sure the point about "safety bars". Is this an argument to eliminate them? It's the law in VT that they be put down. NH it's not. I want the kid to have at least one ski over the footrest. It won't reach, but if they slip hopefully they'll push on it. Way better than no footrest to push on. Leaning back when the back rest is far away can push them forward. Pay attention. Don't hesitate to tell them to stop something you consider unsafe.
Some little kids are highly entertaining, some never shut up, some don't talk. Don't take it personally if they don't say much.
I've never seen injuries from "safety bars" and kids. What am I missing? Certainly not a regular occurence.
Years ago a girl in CT was killed when they jumped off the chair, the bar came down on the second one and caught her under the helmet.