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You already know what it would take to get close to total rust-free bare metal in those areas - media blasting. About all you can do otherwise is vacuum out all the loose dirt and rust and apply a rust converter. I've taped a piece of poly tubing to a shop vac and worked that around inside to suck out the loose stuff. Then take a garden sprayer to spray a rust converter like Rust Mort to convert and stabilize surface rust. You could get some extra protection if you could get some rust proofing paint like POR15 inside. I've done this by working in a small foam roller cover on plastic tubing.
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