A while back I saw a post about someone placing one of those really small chem lites into the bell of a scope to illuminate the reticle as a field expedient illuminated reticle...anyone remember the particulars of that? Link? Pics-description?
saw one once looked like a fiber optic archery sight tube and a mini light velcroed to the sunshade the fiber optic bent around and went almost to the lens and according to the poster lit the reticule without blinding the user.
maybe that might move you in the direction you are looking