actually there is a scope of ICE to TVC after Sabari and before SBC-ERS ICE. There are almost no train in ERS direction during that period. May be something around 12PM departure will be fine. I guess there was a demand for SA-TVC ICE, atleast among rail fans, which didn't materialise till now. Even that will be helpful to remove the long absence of train in that route.
And for Island slot, i feel that current running MEMU can be moved to that slot departure. It will for sure benefit many people.