Set the bike up with proper racks and Jandd panniers.

http://www.jandd.com/

The used market is full of folding field cameras. Photobackpacker sells cases for cameras. Fishpond sells fly reel cases that hold 2-3 lenses.

There are lots of tiny lenses around. Fujinon-W 125mm and Kodak Ektar 203mm are two that come to mind. My Speed Graphic came with a very good, very small Kodak Ektar 127mm lens.

There are decent compact tripods around too. They may not extend way up high, but they will hold your camera steady.

A friend of mine has what may be the perfect sheet film bike camera: A folding 3 1/4"x4 1/4" Zeiss with a 150mm Tessar lens. Folded it's no bigger then my Pentax 6x7. It makes negatives a lot bigger than 6x7 or 6x9.

Good luck!