Doubt AMCA TF intended thrust is poss, without reaching ~78Kg/s Massflow. Similarly
2100deg K TeT certainly means 500deg film-cooling + 200 deg TBC, to reach 4Gen SC (~1120/30deg C) raw metal temp. Plus CMC LPT blades etc
A brand new core, but can be called anything (M88-4/Ganga)
To fathom level of Tech leapfrogging, do note current M88-2 manages
i) 350deg film-cooling + 150deg TBC for ~1580deg C TeT with 1st Gen SC (of 1050/60 deg C raw-metal temp)
ii) 65kg/s mass-flow + 24.5 OPR - I doubt this OPR will allow higher TeT (-ve work extraction impact etc)
To go from 350deg to 450-500deg, film cooling a brand new tech (e.g. diffusion cooling) is required, std laser hole drilling may not be sufficient. Plus maybe lamellar cooling tech etc for the combustor.
This is already getting to Unobtanium level of tech dev ask ...
However wrt F414-class TF (~62KN/98KN), the beauty of M88-2's existing high TeT, would allow for higher mass flow (~75-78Kg/s), without having to tinker with the OPR too much (some is inevitable) to keep resultant SFC degradation in control. Higher mass-flow -> Higher dry-thrust.
And they can also look at higher Gen SC to add maybe 30odd deg C TeT as well, mitigating the SFC impact somewhat. The existing cooling arch (incl TBC) is sufficient as TeT not increased too much.
So net-net, relatively easier (quicker) D&D path compared to AMCA's 5th Gen TF D&D.
Refer to
this post for a similar "upgrade" path related post (for Kaveri).
. I just hope the GTRE continues to develop something on their own as well for the future.