Except for the fact that the exact model of aircraft we have in-game is being fitted with AESA with very little modification.
T2 Typhoons which we have in-game will and maybe already have been fitted with them. If you exclude Qatar and Kuwait Typhoons that have been operating for years with CAPTOR-E then that still leaves test aircraft for all 3 nations and likely a few German Typhoons actually in service or close to being in service by now.
So a T2 Typhoon getting AESA is actually realisitc, as it will happen, and Tranche is rather irrelevant anyway after T2, as it just really denotes when it was built.
But given France already has the Rafale F4 in game like you have stated, and has done for an entire year, it is only fair that our T2s are given some of their full upgrade potential to allow them to compete in a single regard, radar performance, as the Typhoon currently has the weakest radar at 14.3. Its not like it will make Aim-120s or Aim-9s be actually good.

