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The least expensive and possibly the easiest might very well be to use simple thru-wall bracket scaffolding. If the interior walls are unfinished it would be a snap, if they are finished you can run 2 x 6 horizontally with some scrap carpeting applied to the side facing the finished wall. You'd only have a couple 3/4" holes to patch on the drywall or plaster interior. Four brackets will be around $100-120 new and even less if you can pick some up used. A handy guy with a welder and a supply of angle steel could fab up what is needed in a couple hours at best! You can always make use of them again when you do a roof job also.
A big eye bolt or other safety anchor point at the peak will always be a good investment when you use it to clip your safety line/tether into!
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