Thanks for the reply...
It also works , of course, with 7-8-1-2. It adds a color and weave effect to it because of the warp-weft face. I will try 4-5-6-7 to check if the floats are ok (I think it should be fine.)
Moving in and out of it, is from the "proper" block treadling : 1-2-3-4 -5-6 and then continue 3-4-5-6 . then 3-4-5-6-7-8 to return to the "proper" treadling.
Will post other pics