That's already part of the current customisation order.
TRISHUL: IAF Rafale M-MMRCA Costings & Platform Modification/Customisation Details
All the IAF Rafales will feature 14 customer-specific modifications, comprising:
1) integration of the RAFAEL-supplied LITENING target acquisition/designation pod;
2) integration of the RAFAEL-supplied Spice-1000 standoff PGM and its related data-link pod;
3) integration of MBDA-supplied Meteor BVRAAM and ALARM anti-radiation missile;
4) integration of the RAFAEL-supplied X-Guard towed-decoy and development of its on-board location cabinets;
5) u
pgradation of the SPECTRA EW suite to accommodate low-band, medium-band and high-band directional jammer apertures; 6) integration of the TARGO-2 HMDS supplied by Elbit Systems (also ordered by Qatar);
7) installation of a THALES-supplied traffic collision avoidance system (TCAS);
8) installation of a THALES-supplied standby radar altimeter;
9) Optimisation of the M88 turbofan’s jet-fuel starter for operating in sub-zero temperatures at altitudes above 9,000 feet ASL; 10) increase in the capacity of the on-board OBOGS; 11) addition of weather-mapping mode of operation in the THALES-supplied RBE-2 AESA-MMR;
12) development of quad-pack ejectors for the DRDO-engineered and Spice-250 PGM-derived SAAW EMP-generating standoff PGM;
13)assistance in flight-qualification of DRDO-developed 450kg laser-guided HSLD bomb and integration of the bomb’s FOG-based inertial navigation system with the Rafale’s on-board Sigma-95N RLG-INS through a MIL-STD-1553B interface;
14)modification of the Sigma-95N RLG-INS’ coupled GPS transceiver in order to receive MIL-STD PY-code coordinates from India’s NAVIC/IRNSS constellation of GPS satellites.
IN will only have to order it if they want it. Considering how close Bay of Bengal is to the Himalayas, I'm sure IN will have the need for IAF specific stuff for high altitude operations.