Kerala was not having 2 railway divisions since time immemorial. The boundaries of the divisions and zones happened due to the haphazard planning and implementation of Project Uni-Gauge.

The formation of Palakkad/Olavakood division was a consequence of the forced transfer of division headquarters status from Podanur. Would you be okay with shifting the divisional headquarters to MAQ, to retain it with SR?!
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When Nagercoil and Kanyakumari were added to the Railway map, Kerala then carved out the Trivandrum division with from Madurai division. The BG lines (TVC-CAPE as well as NCJ-TEN) went to Kerala and the MG lines (SCT-QLN) were demarcated between the two divisions.

It becomes feasible for the south TN districts to form another division south of Madurai if TVC division allowed for the return of NJT-TEN section and takeover the QLN-SCT line instead.

Similarly, current PGT division is hindering operations on the PTJ-POY-PLNI route and the only way to resolve this is it has to give up this section to MDU division and compensate its track length by adding SRR-TCR and GUV-TCR lines from TVC division.

You can compare the frequency of passenger trains on QLN-PUU section (MDU division) versus CBE-POY (PGT division) and CAPE-TEN (TVC division). There is nothing to talk about MAQ here. One dedicated daily to Bangalore and extending existing trains from MAJN to MAQ would have been a huge relief.

There are 5 odd passenger/MEMU trains between SRR (PGT div) and TCR (TVC div) halting at almost all stations en route. And this is one of the busiest lines in the country, see how the coordination between divisions doesn't become an issue here.

Given the volume of rail traffic in Kerala alone, you could very well do without managing the issues of NCJ or POY or MAQ. MDU division or MYS division are not as busy and also would be the source of the bulk of passengers travelling to/out from these locations (if adequate services were in place).

600 km track length is the minimum required track length for a division. Both PGT and TVC divisions could have added to their track length by fast-tracking the Sabari Line, Guruvayur-Tirur line, Vizhinjam siding line etc. This would have allowed for 2 divisions to continue to exist in Kerala.

Neither doing that while also stonewalling the concerns of neighboring state cities/towns cannot be a perpetual state of affairs.