Used https://github.com/Norbyte/lslib to extract Baldurs Gate 3\Data\Shared.pak

Make a bakup right away pls

Edit Equpment.txt from Public\Shared\Stats\Generated like so:
new equipment "EQP_CC_Cleric"
add initialweaponset "Melee"
add equipmentgroup
add equipment entry "WPN_Greatsword_2"
add equipmentgroup
add equipment entry "WPN_Longbow_2"
add equipmentgroup
add equipment entry "OBJ_Potion_Healing"
add equipmentgroup
add equipment entry "OBJ_Potion_Healing"
add equipmentgroup
add equipment entry "OBJ_Scroll_Revivify"
add equipmentgroup
add equipment entry "ARM_Cloak"
add equipmentgroup
add equipment entry "ARM_Boots_Metal"
add equipmentgroup
add equipment entry "ARM_Belt"
add equipmentgroup
add equipment entry "ARM_Plate_Body_2"

Warning. The cloak makes the game crash in some cutscenes.

Edit character.txt from Public\Shared\Stats\Generated\Data like this to equip on anyone. 
new entry "_Hero"
type "Character"
using "_Base"
data "Vitality" "1"
data "XPReward" ""
data "Sight" "1850"
data "Hearing" "1800"
data "SpellCastingAbility" "Intelligence"
data "ActionResources" "ActionPoint:1;BonusActionPoint:1;ReactionActionPoint:1;SpellSlot:0:0:1"
data "Passives" "AttackOfOpportunity;Backstab;DarknessRules;ShortResting"
data "Proficiency Group" "SimpleWeapons;MartialWeapons;MediumArmor;HeavyArmor;LightArmor;Shields"

Save, create package with tool and overwrite