2 years ... nice

There were three blocking factors
1. GraphHopper developer wasn't sure what he wants
2. GH developer had not much time on this project
3. no way to provide data to users
And situation now
1. GraphHopper developer work on this project on full time
2. He still don't have a time, so I decided to make add-on as own project
3. we have store to distribute routing data now
So here it is, working offline routing together with actions (not jsut plain track without navigation).
There is still missing a few features (like roundabouts), but I already ride around 300 km by car and 200 by bike with it and it works
