Bleach pens are like permanent markers, except with bleach instead of ink. As for stencils, you can laminate them, or make them out of something plastic-y. I have a construction paper stencil that was okay with spraypaint, you just have to let it dry. Don't know if bleach's corrosive nature would disintigrate construction paper though.
As for keeping the bleaching to the design, remember, less is more, you can always go over it again. I reccomend using a foam wedge style paint brush
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