I'm chiming in only because this has not been mentioned as yet, and may be a possible solution to what you are looking for.
It has been on my list of potential portable 4x5 cameras for some time, but am still using my Super Graphic, and now Sinar C, which meet my current 4x5 needs.

It is the TOHO FC-45X and I can't add anything to what Kerry Thalmann had to say about it.

Good luck.
David