Shouldn't be too difficult to sort out. Most framebuilders should be able to make a custom one. If not, look at motorcycle handlebars and a 25.4 -> 22.2 adapter.
Any rise or daft shaped bar is a non-starter. Its for the P20 and i'm not going to sacrifice style for speed!!
Salsa look a possible. titec seem to have disappeared??
Surly had Nitto make them a nice lightish weight bar that's 666mm wide, silver, no rise, decent sweep and 25.4. Can't for the life of me think what they are called but I have one somewhere......