I concur on 1. I will have a play in MyRoute as an experiment too.OK
1. In BaseCamp, it might be easiest just to trace over the route, making any amendments as you go.
2. Yiu should be able to amend the route quite easily in MyRoute. I have certainly made several versions, since sharing this one.
Make a copy and play about. You can’t break it.
However, thanks for putting something together for your friends in MyRoute. We can all use that as a starter.