I am sorry for my crazy bad English 
too excited with an idea! It is working: https://drive.google.com/file/d/0B-7cg8BSq1Z_eGdPelFHT2ZneFk/view
So, will try to explain more correctly.
Right now the only step which activate “sticky nav” appearance is a header - scrolling OUT of view. Workaround: to add one more interaction to the object, which scrolling INTO view, when page loading with in-page linking