In my opinion: choose
- either Agra or Gwalior
- Manmad, Nasik & KYN : All are near to Mumbai, and have proper connectivity.....comparing with Chennai Rajdhani won't be good here. There may a technical stop at KYN.
- compare the stoppage of your imaginary rajdhani with BCT Rajdhani.
-...
more... In case , you don't want to remove these stoppage then think, why not 22110 should be converted into rajdhani with increase frequency to tri-weekly