Hi again
Eventually it turned out that a simple adjustment of the rod connecting the slave cylinder and the lever arm at the bell house, as well as another bleeding of the hydraulic system solved the problem. It is possible to extend the lenght of the rod by turning it and fasten it by the lock nut. I've extended the rod approx 5 mm and it works. It's now possible to engage 1st at stand still and also engage reverse without grinding. However, the slave cylinder rubber cover has almost disintegrated and a complete new slave cylinder assembly has been ordered and will be changed as soon as it arrives.
Thanks to all for your inputs.
Cheers
/Finn