In fact, BDTS CDG biweekly runs in that route and it is quite fast. It bypasses NDLS NZM and stops at Gurgaon and Delhi Cantt.
This route to be utilised more.
Pune Ahmedabad in 9 hours (Duronto) plus another 9.5 hours to Jaipur and another 3.5 hours to Delhi. Max 21 hours.
YPR SUR via KLBG 11 hours plus 3 hours to Pune.
Total 34-35 hours for Bangalore to Delhi via Pune, Mumbai outskirts, Vadodara Ahmedabad Ajmer Jaipur.
Think of connectivity, it will be excellent.