I have no idea what their policy will be for International, but IMSA.com will be showing a video live stream of the nightime hours 9PM-7AM EST. Even in the US, they are stopping TV coverage for those times, so the website will be the only place for coverage. So, if they are not region blocking, you may be able to see some of the race during that time.
They also mentioned IMSA.com will host replays of entire races after the broadcast coverage ends here in the US, so you may not be able to see it live, but can probably catch it shortly thereafter.