The Beamish has to have a chrome frame, it's part of look and history of the bike.
As for chrome paint, im sorry but it will just look a bodge to me.
It's just a bright silver paint, you can see it a mile off. Don't be fooled by the chrome cap on the can, that isn't how the paint looks when used, I have a can, I tried it on a cover on an old yamaha fs1e. Just came out a very bright silver and soon goes to looking dirty.
OK I guess for an old knacker, that you aren't bothered about.