Is it possible to update players character from data from a string value?

hello! i want to make a morph gui that updates string value inside the player and when player joins, the script will assign character to the string value inside the player i tried to make a script but i cant figure out how to make it work

local john = game.Workspace.John
game.Players.PlayerAdded:Connect(function(plr)
    game.Players.PlayerAdded:Connect(function(plr)
        wait(2)
        if plr.AvatarStats.AvatarID.Value == "john" then
            local johnclone = john:Clone()
            johnclone.Parent = john.Parent

            plr.Character:Destroy()
            plr.Character = johnclone



        end

    end)

end)