Just to keep you updated:
Looks like for the hiking purpose I finally decided for 4x5 (at least one decision finally ;-) ).
Favourite cameras right now are:
1. TOHO FC45 X (lightweight monorail, maximum flexibility in movements)
2. Tachihara 4x5
3. Chamonix 045N-2
The TOHO seems near to impossible to get in Europe ... I will keep an eye on
ebay and wherever if I can ever catch one. But for this summer it seems impossible to get.
The Chamonix seems a good camera, but lacks the nostalgic touch of the Tachihara, so hence I think my current favourite is the Tachihara.
It appears to be hard to get one in Europe these days, and good 2nd hand offers are very rare and overpriced. But nevertheless I will try if I will have any luck.
As for the larger formats, I want to keep my workflow compatible up to 8x10 if possible, just in case I will later get a larger format camera such as a Linhof or similar/cheaper. But they would not be for hiking, just for car based journeys ;-)
.. so first goal now: to get a Tachihara plus one or two lenses (maybe around 75 and one around 120mm)