Yes I have good luck with plating over solder (lead free) but to get those little imperfections out you need to make sure you get enough copper so you can buff it down to a smooth surface, make sure you flash copper first then acid copper for about 2hrs. this should give you plenty of copper to play with but be careful and don't let the part get too hot while polishing. If you have enough nickle you might can try to polish it down and get the finish that you need or a very fine 3m disk on a die grinder.
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