In reply to aeroj:
Disclaimer: I haven't been to the Julians in winter, but have been there when there is a lot of snow around in spring so treat with caution.
If you can get to Vrsic then the normal route up Prisank (past the window) would probably go. There's 1 rock step, but it is fairly short and if it's not banked out you can probably use the summer metalwork.
I did the VF up through the front window when the N face was still banked out with snow a year or two back. Large sections of grade I/Easy II snow. Probably a nightmare if it's unconsolidated but would be OK if it is hard. Two rock sections won't be easy but again you may be able to cheat.