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Yea freeze plug that just the right size could easily be painted, easy option would be a rubber freeze plug but you would have a wingnut on top and would look like crap...definately wouldnt fit in under your hood lol.
Measure the hole as close as you can or take the intake to an auto parts store. Back when I worked at Vatozone we kept some in stock. You want one that almost fits in but is VERY SLIGHTLY too big. If its too big and you force it you could crack the plastic.