"Too many Cooks spoil a broth"
Sometimes trying to connect everyone makes the connection useless. I don't disagree with your proposal would've supported it unequivocally. ONLY issue is, the OHE abomination that NWR has created in the name of Double Stack freight spoils the entire route. Even after full electrification trains can't go for 130 MPS on electric traction and railways will avoid going for 130 MPS on Diesel.
After crossing Itarsi (if it goes via Bhusawal) or Vasai Road (if it goes via Whatever route Kota or by your suggestion Jaipur), it...
more... needs to have 130 MPS clear route in order to be at least a viable option for the Places for which this train is originally intended Hubballi, Belagavi, Miraj etc.
Route via Jaipur although much more promising becomes the issue here. Recently too many cases of OHE breakdowns and tangling with Panto were there. Plus getting special locomotives also becomes a headache.
You yourself know Railways won't go for that option willingly.