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I wouldn't attempt an acid treatment, even as a last resort. It will get into the seams and be virtually impossible to completely remove, possibly resulting in more corrosion and leaks.
In my experience and everyone else I know who's tried one, those ultra-fine filters don't work. They either plug up real fast, dissolve from the ethanol, or serve as vapor lock site. You might get five or ten miles, but be prepared for a roadside removal. My guess is that they only work for folks whose system is so clean they don't really need them, which would not be you. If you ask around among your Model A friends, they will probably give you one to try from their junk box--I would.
Also, the inline filter caused total vapor lock for me, but that's a very variable thing.
Maybe the rust is so fine it won't cause a problem. Does it? leaking float valve, plugged jets?
I pulled my tank and had it cleaned and sealed at a Renu franchise, about 15-20 years ago.
Steve