Characters inside viewport frame

[FireStarFlame7 (Humanoid)]

I want to have the entire world inside a viewport frame, but I’m unsure on how to go about this.
My main issue is player characters, as once their parents is no longer within the workspace, they no longer update. Is there anyway to get around this?

[Alfiepro98234]

RunService.RenderStepped:Connect(function()
	for _, player in pairs(Players:GetPlayers()) do
		local realChar = player.Character
		local fakeChar = worldModel:FindFirstChild(player.Name)

		if realChar and fakeChar then
			for _, part in pairs(realChar:GetDescendants()) do
				if part:IsA("BasePart") then
					local fakePart = fakeChar:FindFirstChild(part.Name, true)
					if fakePart then
						fakePart.CFrame = part.CFrame
					end
				end
			end
		end
	end
end)