Non-folding 4x5 with rangefinder choices?

[genotypewriter]

Anyone have any suggestions for a non-folding portable 4x5 camera with a coupled-rangefinder?

I'm not looking at the more common Polaroid-conversions as they require opening and closing. The Chamonix Saber is OK but they're very hard to find and take non-standard holders, AFAIK. The ideal camera would be something like a Ebony RW45 with a rangefinder... if there's no such thing, what would be the most straightforward way to do it? Are there external rangefinders that can be coupled more easily than others?

Any suggestions? Thanks in advance.

-Guy