Try this plan...
DAY 1. Islamabad to Naran, night stay in Naran/Batakundi
Day 2. Leave for Hunza early morning visit Rakaposhi view point on the way and then night stay in Hunza.
Day 3. Leave for Khunjrab pass early morning, visit attabad lake on the way, come back to Hunza Stay for the night.
Day 4. Visit Eagles Nest, Baltit fort, Naltar Valley go direct to Gilgit and night stay in Gilgit.
Day 5. Leave for Skardu in the morning. Will make it there by evening. Night stay in Skardu.
Day 6. Visit Shangrilla and Kachura lake as well as the cold desert then night stay in Skardu
Day 7. Leave For Deosai early in morning. sadpara lake will come in between. also visit Sheosar Lake in Deosai and back to Skardu and night stay in Skardu.
Day 8. Leave for Batakundi/Naran stay a night.
Day 9. Leave for Islamabad in the morning.