I saw a quotation from grayhill recently and the time was 14-16 weeks. not exactly the same switches but close.
I´m waiting for some switches from Blore-ed lets see how it goes.
You can stick headers in place of the Grayhill and then wire the 3 deck Grayhills to them. It's not every tab that is used. A little adjusting and it'll work, albeit its tight. If your real brave you can wire it directly, but I wouldn't advise it.