I have Mast Mate (I think that's the name) mast steps that run up the sail track. I climb slowly and always work with just one hand. I like it much better than a bo'sun's chair.
I also plan to fall into the drink, and not onto the deck.
with a ketch, the main mast is only 35 feet off the house, so what's the worst that could happen?
I would do the same if I had someone to help me, after all, what are they going to do - catch me?