How would I go about changing a humanoid's rigtype ingame?

I want players to be able to change their rigtype (r6 and r15) without going to the roblox avatar and resetting in game..is that possible? i tried a simple chatted event and used _G variables but when i want to change to r6, everytime i respawn i die again. help?

chatted script in serverscriptservice:

_G.r6 = false
game.Players.PlayerAdded:Connect(function(player)
    player.Chatted:Connect(function(msg)
        if string.lower(msg) == "/r6" then
            _G.r6 = true
        elseif string.lower(msg) == "/r15" then
            _G.r6 = false
        end
    end)
end)

changeRig script in startercharacterscripts:

while wait() do
    if _G.r6 == false and script.Parent.Parent.Parent.Humanoid.RigType == Enum.HumanoidRigType.R6 then
        script.Parent.Parent.Parent.Humanoid.RigType = Enum.HumanoidRigType.R15
    elseif _G.r6 == true and script.Parent.Parent.Parent.Humanoid.RigType == Enum.HumanoidRigType.R15 then
        script.Parent.Parent.Parent.Humanoid.RigType = Enum.HumanoidRigType.R6
    end
end

updated:

while wait() do
    if _G.r6 == false and script.Parent.Humanoid.RigType == Enum.HumanoidRigType.R6 then
        local pastChar = script.Parent
        pastChar.Archivable = true
        local newChar = pastChar:Clone()
        newChar.Parent = workspace
        newChar.Humanoid.RigType = Enum.HumanoidRigType.R15
        local description = game.Players:GetHumanoidDescriptionFromUserId(game.Players:GetPlayerFromCharacter(script.Parent).UserId)
        newChar.Humanoid:ApplyDescription(description)
        repeat wait() until game.Players:GetPlayerFromCharacter(script.Parent)
        game.Players:GetPlayerFromCharacter(script.Parent).Character = newChar
        game.Players:GetPlayerFromCharacter(script.Parent).Camera.CameraSubject = newChar.Humanoid
        game.Players:GetPlayerFromCharacter(script.Parent):LoadCharacter()
    elseif _G.r6 == true and script.Parent.Humanoid.RigType == Enum.HumanoidRigType.R15 then
        local pastChar = script.Parent
        pastChar.Archivable = true
        local newChar = pastChar:Clone()
        newChar.Parent = workspace
        newChar.Humanoid.RigType = Enum.HumanoidRigType.R6
        local description = game.Players:GetHumanoidDescriptionFromUserId(game.Players:GetPlayerFromCharacter(script.Parent).UserId)
        newChar.Humanoid:ApplyDescription(description)
        game.Players:GetPlayerFromCharacter(script.Parent).Character = newChar
        repeat wait() until game.Players:GetPlayerFromCharacter(script.Parent)
        game.Players:GetPlayerFromCharacter(script.Parent).Camera.CameraSubject = newChar.Humanoid
        game.Players:GetPlayerFromCharacter(script.Parent):LoadCharacter()
    end
end