Aside from taking it apart, blasting, rewelding, etc, your suggestion is about all you can do. There are plenty of hidden, non-accessible, or not worth the effort examples you may find this to be the best solution. How about the surface rust inside the quarter panels or doors that has not broken through. You gonna take the whole quarter off to blast and paint or spray it with a rust converter and sealer as you suggest?
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'73 Buc Red T/A, 4 speed, A/C, Std Black Interior
"If you choose not to decide, you still have made a choice" RUSH (Freewill)
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