You can "rent" a bike in Delhi and dump it anywhere you feel like provided you want to forgo your caution deposit.
Oh! And I made that itinerary assuming that you are comfortable with hundreds of kilometres of off-road with mostly loose gravel and potholes in lieu of tarmac.
That is easy: Just leave out Nubra and Tso Moriri!
Day1: Delhi - Srinagar, Leave at 0400 hours. It can be done.
Day2: Srinagar - Leh: Leaving even at 0700 hours it can be done despite Godzilla Pass!
Day3: Leh, Permits, K-Top and back. Can be done provided it is NOT a Sunday! This is easy
Day4: Leh - Pangong - Leh. Also can be done.
Day5: Leh - Manali.
Day6: Manali - Delhi! There, you have your programme!
Do not try this on a Zma unless you know how to rig the Main Jet.