I think this is the more practical solution.
But I have another gimmick alternative:
-All units have a faith “HP”, from 0 to 100, and a Faith Armor Class.
-Monks have an “attack” that deals 25 “damage” to Faith Armor and reduce his own Faith HP too (-25 points).
-When target’s faith HP reachs 0 the unit is converted and recieve +50 faith HP.
-If monks faith reachs 0 (exahusted) he must wait ultil faith recharge to 25 points (this mean, each “attack” consumes 25 faith).
-This faith gauge regen slowly for both, attacked units and monks (A little faster for monks). This mean that a unit can scape from convertion, but its faith remains weak for a period.
-An exahusted monk is easy to convert by enemy monks.
-A recently converted unit is easy to re-convert than a non attacked unit.
-Lets say Monk’s RoF is 5. When a group of monks target the same unit. The first attack do full damage but next faith attacks during next 5 secs will do only 20% damage (Still consume 25 faith for all monks). This mean, for insta-convertion you need 16 monks, and f.e 3 monks can convert a knight in 3 wololos but all of them consume a total of 225 fatih HP to make the conversion.
-Nerf to building construction denial by targeting vils repeatedly.
-No more “charge” convertion with buildings.
Some tech/bonuses changes:
-Faith and Convertion resistance (Teutons): it means positive faith armor.
-Inquisition (Spanish): More faith “attack”
-Illumination: Faith regen is faster for Monks
-Theocracy: Monk’s faith HP consumed for attack reduced.
-First Crusade: Could give more faith regen for all units instead of convertion resistance (faith armor). To differenciate of Teutons.
Some new tech/bonuses that this mechanic could able:
-Warrior Monk: Each melee attack make some faith HP damage too. Potencially you could take a fight, weaken enemy’s faith and try to convert them.
-Relics: Could provide buff to faith attack, armor, or regen.
-Enemy’s faith HP is visible. It means, more efficient conversion. Still require micro
-Own Units’ faith HP is visible. It means, more efficient protection vs enemy monks. Still require micro
-Elephants could have a extremely faster faith regen but negative faith armor. This mean that they are easy to convert, but you need more than one monk to do it.