Maybe the [url=http://www.tiffen.com/displayproduct.html?tablename=domke&itemnum=700-80B]F-8[/url]? Although the 1Ds/85L combo will bulge the front on that. You're essentially looking at trying to house a 6" pyramid, and I think the F3x is probably the smallest of the classic Domkes that wouldn't have to stretch in at least one direction to hold that. If you're willing to keep the lens and body separate while bagged (but, I ask myself, why?) the [url=http://www.tiffen.com/displayproduct.html?tablename=domke&itemnum=700-52N]F-5Xb[/url] would probably hold them.
Tiffen's announced a new line of Domke bags, but they're not up on their website yet, that I can find. One of those might be a better fit, though from what I've heard they're heavier on the padding than the Classics.