European treasures and WC civs

New maps comes with a new kind of treasure, this ones with actual units instead of guardian specific ones, being some of them mercs.

Now, We have the WC civs with their conversion ability, that cant be used on mercenaries.

While its supposed to balance them and avoid age I attacks with this stronger units (or that I think), its unfair for inca and aztecs that dont have a 1 kill shot while europeans do. Also aztec one dont secure a kill neither.

conversion > killshot
convert another unit and use it to kill the merc treasure guardian