1, Chillas to Besham -> some patches are not good (Approx 50 to 70km), but you will go easily. I traveled last year.
2, Security condition is good.
3, Gilgit, Hunza and Malamjaba guest house available you can book on runtime. about Dasu, I have no idea.
this is My last year trip and almost same route like yours. My Trip Details