As Ernad is running empty after Kasaragod, why not tweak TT? Let it not start at ghost hours from NCJ. Let it start late to arrive MAQ by 1930 to 2000 at MAQ. Then it can go to Bangalore as ONT.
There are plenty of trains running with 2S and Sleeper (AC and Non AC) running as day time ICE in some stretch and ONT as other. Check MS MAQ, MS GUV, MS TJ Cholan etc.
MS MAQ MS is ONT for TPJ/ KRR/ ED. Then an ICE or rather...
more... Fast passenger for ED MAQ ED.
MS GUV is ICE for MS TEN MS, and ONT for TEN GUV TEN.
MS TJ is RSA of Pandian/ Rockfort.
So, nothing wrong in running a train with 2S, SL, 3A and 2A.