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Tim,
You may be missing something regarding the air needing to be safe. If we are DECOMPRESSING a diver lockout with an air pump, and the air is being pumped outboard into the water, it doesn't need to be breathable anymore. If you are saving the air by recompressing it back into some bottle, then you are correct, depending on the purpose of the next use. (It may be that, that air would be used to blow ballast at the surface) The size and quality of the compressor changes dramatically if you want to stuff a bunch of air back into a little bottle, ie. high pressure.
Gene
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