Hi Dear!
I advise you to go Astore to Deosai then Deosai to Skardu.
Your ride can do it but need proper checkup, maintenance works done before starting journey also check Tyres & spare tyre wear.
At Astore Charge your fuel tank because there isn't any fuel pump all the way to deosai & skardu.
Also do some Food Backup.
Astore to Deosai is Mettled Road (Normal Valley Drive), In Deosai there's no Road, It's like 4x4 path, at some points there is dead speed continues bumps, but you can cross with lil extra care & lot of patience.
In deosai You can stay at Bara Pani camping sight for night, there's one & only Kitchen (desi dhaaba).
Deosai to Skardu is unpaved road, Continues downhill, Sharp cuts. Again driving skills & lil Patience needed.
Let me know if any questions.
Best of Luck for Your journey.
At Sheosar Lake.