I'm assuming that you are wanting to coat them to reduce/eliminate lead fouling.
Any coating that you apply will have to be flexible enough to stay put on the bullet while it is getting squeezed down the barrel, up to 0.004" of compression for a 30 caliber round.
It would also have to resist the temperature of the burning powder and the friction between the bullet and the barrel.
All of your suggestions cover one or two of the issues, but not all of them.
The cheapest and easiest coating would be electroplating the bullets with copper. All you need is a tank, a wire basket to hold the copper, a wire basket to hold the bullets, a conductive liquid (vinegar), and a low voltage power supply - a 6 volt battery or a 6 volt low amperage battery charger.
Copper plate, size, gas check, and lube.
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