SWR wont allow for MUMBAI-KONKAN-MADGAON -HUBLI-BELLARY-GUNTAKAL-CHENNAI ,.
A daily between CSTM-MAS via the remaining two routes , 3 days via Hubli and 3 daysvia Bijapur and one day via KRNT is a good suggestion from you . The old idea of permanently diverting is bad , we should not disturb the popular train's routes.