Some comments
12-xx codes are for 12th Wing based at Cambrai, an air defence unit
the first letter of the code identify the squadron, Y for 1/12 squadron "cambresis", the tiger squadron, K for 2/12 "Picardie", the second letter identifying the plane individually
no H series....
as for the tail marking, it represents a warthog (or its european counterpart anyway) and is associated with 3 Wing based at Nancy, an air to ground unit
So, I would say the code 12 is nice for a 2000-5 but the tail marking should be adapted to reflect one of the two squadrons from 12th wing or Escadre de Chasse as it is known in France
All comments meant to assist in making a more realistic skin, nothing else