Are you afraid that the topping lift alone is not safe? You are probably right about that, since it is probably smaller and you have not inspected it's full length. It could be horribly chafed at the masthead. OSHA says two means of support.In my hunter 41 the halyard of the spy (the only unused) and the halyard of the genoa came out the mast about 3 feet below the top of the mast.
I have seldom roller main, so the only halylard that goes all the way up is a pain to use.
Do i am missing something? Can i relay on the halyard of the boom? How do you get all the way up?
One way is to replace the line with something safe. Just pull a climbing line through. For a back-up for the first 85% of the climb, lower the genny and use the halyard. For the second part, place prusik slings around the entire mast; they will slip some if you fall, but only very slowly and you will still be clipped to the genny halyard.
No, you do not send children up the mast if safety is the concern. I'll pretend I didn't read that.
[Ignor my avitar--I've had bigger boats and I've climbed all over.]