The more I dig, the more I find. My objective has 100% changed to slowing the rust and providing structural support so that the strut towers outlive whatever else kills the car. Based on my experience, I think I could have blissfully ignored the situation for a few years or more without any catastrophic failures.
With that in mind, I dug out all of the loose stuff and hit it with Rustoleum Rust Reformer. I'll add patches to reinforce, and call it good. If I were to do a good job at this, I can't see any way that it doesn't scope creep into "fixing" all of the rust in the quarters, rockers, etc. This is not the car for that level of effort.
