Matthieu
>>I have seen it is possible on the KL25 version of the board
Where have you seen this?
Since the KL25/KL26 have SWD and no trace pins they are limited to the CoreSight Micro Trace Buffer to provide trace capabilities.
I wouldn't envisage any differences between boards since only the SWD wires are involved. Also I wouldn't expect any debugger types to have advantages in this respect since all trace suppport would be via SWD and the controlling software.
Regards
Mark