Looks like a trip you'll savor for a long time. And you timed it just about perfect, given the recent developments (although, Leh should not see much of the turmoil). Thanks much for sharing! Brought back memories from more than a decade ago...
Second the advice to fly in to Leh (but take enough time to acclimatize there before going any higher). IIRC, flights from Delhi are available year round. Tons of big, steep, and many not so steep, hills to keep one busy for many years!