Hi friends,
Just to update you that I had an amazing cyclo-trip of the Bernese Oeberland and am back (and will catch up with all the EF bike banter and rides soon).

The route I finally followed was:

Zurich - Lucerne - Interlaken - Chateau d’ Oex* - Berne - Zurich
The distances were approx: 60, 75, 80+, 80+ and 140 kms for each of the legs. Actually much of the itinerary was spontaneous, and I used your suggestions just to get a hang of the things.

* At Chateau I spent an extra day and climbed a 2000+ m hill (Point de Cray) on foot. It is about 1000 m above Chateau.

Weather was fabulous (making all my winter/rain gear redundant), and got sunburnt within 2 days. Except the Berne-Zurich leg, all legs were picturesque and I enjoyed to the hilt. Perhaps Interlaken-Chateau was the best.

Each leg seemed to get easier rather than harder than the previous one...Today was the bigggest ride of my life: Berne-Zurich and surprisingly I arrived in Zurich in pretty good shape.

Since I didn't have the bike computer I can't post those technical details. But I will post some experiences/insights I got about this route for reference.