If the idea is to connect delta districts to Palani/ Pollachi/ Coimbatore, there is no need to take it upto Palakkad. It can go via Kinathukadavu.
When Netravathi and Mangala are restored via MAQ, with decent quota of seats and when MAQ SBC gets a dedicated SR train, I will stop talking about Palakkad division's partiality to the area which feed PGT's existence.