Let them have a ball.
My guess is that the Chinese will offer mpney and defense assistance to Guyana real soon, it may already be happening since there is a Chinese presence in South America already in other countries (e.g. Ecuador).
Jammy Cahtah gave the Panama canal to the Chinese (great move Mr Peanut) so transit to the Pacific is not an issue. All they need to do is get a source of cheap oil.