Bro, you missed the point entirely.
It wasn't about justification for Pune Delhi Route, my whole point was about justification for dependency of Delhi bound SWR Trains on Secunderabad and Pune.
Same justification applies to your proposed route as well, at least for a time when these trains were introduced.
First of all getting slots at Delhi is a herculean task and getting slots...
more... in single line section of CR is a headache.
Secondly even if you DO manage to get the slots, SWR itself knows terminal has to be Bengaluru as even after being a Zonal Headquarter Hubballi doesn't have that much of demand for Delhi to justify a Bi weekly without involving Metropolitan Cities like Pune or Secunderabad on the route.
Bengaluru is out of picture for Normal Superfast Trains Patronage as none of them are via shortest route. Unless and until someone has emergency, people won't prefer KSK's that easily from Bengaluru.
For the same reason KSK was diverted via Hubballi instead of starting a new train from there.
Even now getting seats in KSK Via Bhusawal is easy enough between Pune and Bengaluru which won't be a case had the demand from Hubballi that strong enough.
So your intentions are completely valid, problem is the demand wasn't enough when these trains were introduced. Nowadays they could divert it and they should at least one of them.
My point is- Chandigarh waali shouldn't get diverted as there won't be any justification for Chandigarh and Ambala to go through a longer route to Bengaluru plus there's not much demand for diverted Gadag route from there.