From what I can see of it, this blade does not look too bad at all.
Use a needle or an awl to pick the rust away, for the very small areas involved I wouldn't even use the cold blue, just a good drench with WD40 and then the usual keris oil.
I doubt that this blade needs a full clean and stain, but if it did, I would not hesitate to either do it myself or have it done commercially.
Storage in a plastic sleeve will help prevent further rusting. If you're in Indonesia, go to your local toko plastik and buy some of the plastic sleeve that is used to put snack foods in to sell in the market.Make sure its wide enough to take the gonjo.
I have preserved the original stain on a couple of Bali blades by using magnification and a needle to go over the entire blade and pick rust out of the pits and irregularities on a blade. In each case the job took about 2 or 3 months, working nights, and when I felt like it.
Cold blue may not be available in Indonesia. It is used on firearms to touch up small areas where the hot blue has worn away.
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