1. cycleway=lane
  2. cycleway=shared_lane. This is pretty informal, as cars can behave as they are not there. However, “De Fietsersbond” have found in a study that they increase the safety of cyclists.
  3. I’ve never seen those markings in the middle of the road. Does not mean they do not exist, but I would expect them to be on the right hand side of the road.

According to https://www.gratisrijbewijsonline.be/theorie/leerstof-rijbewijs-b/fietser-fietspad-oversteekplaats the markings in(3) do not exist