Kit changes per gamemode

In certain gamemodes like EggWars & SkyWars, there are kits that you receive that become completely useless or completely overpowered when the gamemode is changed - for example, in EggWars, the armour kit (full leather armour) is useless when OP is voted, as the armour does not turn enchanted, but is very very overpowered when hardcore is voted, because leather armour costs 32 iron a piece.

There should be a system that changes items to be the equivalent for their gamemode counterparts. Unless there is a way to do this automatically, perhaps there can be different kits for each gamemode, for example there'd be an Egg Armour kit for Normal, OP, Hardcore. This would mean we'd need to change most of kits for SkyWars & EggWars for their gamemodes, so we'd need 6 kit sets for those two gamemodes.