I agree that local action should do for the tang. Try a good mineral oil for the bit of rust between pesi and gonjo and utilize a wooden toothpick and brush to clean the crevices.
Based on the bold pamor alone, I don't think this is a Segaluh blade. Can we have a pic of the whole blade, please?
IMHO the kembang kacang is in fair shape and will withstand gentle cleaning with no problem. I'd try to clean off the limited rust first rather than giving the whole blade a wash.
In a dry climate, even "active" red rust can be stable and may not progress - a conservative strategy may be ok if you can make sure that humidity won't hit such a blade (warm humid air meeting a colder blade indoors is the most likely culprit). Keep the blade well oiled though - "dry" red rust is not a good sign.
Regards,
Kai
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