Springstay location question

[mariner2k]

Hi, My current ketch has a springstay which ends part ways down the mizzen. There is a jumper strut that picks up some of the load, but ends about 5' from the top, then there are just the backstays.
My old ketch's stay went to the top of the mizzen. My concern is that there is not a lot of support if I wanted to go up in the bosun's chair. It appears that I'd be depending on the strength of the mast to support me.
Would I be better off either adding another stay or moving the existing one to the top?
Thanks, Kevin

After reading through the forum, I found some info on the subject and realize that I needed to add some information.
My main mast does have two backstays, independent of the mizzen. ( I know). I have sailed the boat for a season as a sloop while I rebuilt the mizzen. Not bad in a good breeze. Once again my concern is hauling my 210 lb. m ass up the mizzen. The unsupported top looks a bit like my weight would not be compressing vertically, but bending back.
Also I would like to be able to re-rig so I can fly a mizzen staysail if possible. Tough to do with the lower spring stay, I'd love to lose it. The old ketch had no back stay on the main. It depended on the spring stay. When I re-rig the main I could change to a split back stay.
Thanks, Kevin