I don't think cost effective and plating belong in the same sentence. I've only had one thing plated 5 or so years ago and that was a seat crash rail. Charged $35 Said later they made a mistake that it should have been $60 but still honored the price. Proctors in MI used to be the go to place for bike stuff. Different family members now run it as Kro-Pro.
Lol, no such thing as cost effective chrome! If you are prepared to pay the price, contact Artistic Silver plating in Signal hill, Ca. You can ship to them. Call Greg or his wife Sally and talk to them. I handed him 2 five gallon buckets of parts (sm nuts and screws). Did not lose 1 part and 10 yrs after, chrome looks great!