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@lae
I really wouldn't drill any holes in your frame - corrosion in the interior of the BB shell is generally not a problem; it's difficult for water to get in there in the first place. Chainstays are the worst places for rust, especially the RH one as the paint is battered off by the chain, and grimy salty crap collects in the nooks and crannies around the rear of the BB shell/mudguard bridge area (made worse by the fact that this area is a bit difficult to clean).
Personally I fill the frame up with linseed oil (it coats the inside of the tubes and then dries - back in the day it was used to protect steel aircraft and racing car frames from internal corrosion) - other people use JP Weigle frame-saver, or automotive products such as Waxoyl.
If these products are good enough for car chassis that have significantly more water traps than bikes, and are cleaned considerably less often, then they are good enough for the interior of your frame tubes. Protecting the exterior of the tubes is pretty easy - just wash your bike regularly (or at least hose off the road grime with clean water), and apply a wax if you feel like it (I use an automotive wash-wax).