Your best bet is to find a shop that has a solid rep for doing plating very well. As I mess with antique cars and hotrods a lot, I would recommend a trip to the magazine rack. Look for Street Rodder, Street Rod Builder, etc., In the back you will find ads for shops which can easily do an entire front end for a 1958 Caddy and do it to concurs perfection. They can handle a bike frame and do it to absolute perfection. Email them for advice and recommended way ahead. Expect to pay a couple of hundred dollars per frame. Its ok to comparision shop, but if some shop quotes you a low ball price, take your frame and run away.

BTW; Hot Rodders know that today there are several paints which can rather closely approximate the shine and color of chrome. I know I have re-painted a chrome early Ford windshield frame and it still looks 98% like nice chrome 5 years later... Cost $25 for materials and 10 hours of labor but worth it.