according to lua code there WILL be a conflict.

BecomeDesense is removing a bunch of traits including brave upon successful roll.
BecomeBrave will do nothing if you've become desensitized.

so if you become brave first you will have it untill you get desense trait which will remove it.
even if you setup kills so it should appear after it will still won't grant you brave since it checks for desens.

tldr literally useless if you have Desen mod.

oh and brave is only removing Cowardly trait