Please don't take me wrong, But I don't suppose any new trains on Ghats or either other trains like 12685/86 to be re-routed via HAS, Consider the example of 16575/76, & also Opposition from Intermediate Stn's Passenger Associations in TN & KL for Re-routing. Most can be done is trains upto HAS.
Please Remember : -
What we got is only Alternate (Short) line between SBC - HAS & Nothing Improvements in Ghats. Nothing can be Expected till Ghats doubling is done & HMRDC is done away.