Your best bet is an escalation of the Caste War, with Britain far more actively supporting the Maya rebels-- presumably in return for their agreement to become a British protectorate (self-governing but very much open to British economic activity) after the war. With British support, the whole thing becomes such a success that adjacent (non-Mexican) regions where the Maya population is a majority also rise up and seek to join the independent Maya state that is taking shape. The British, none too shy about getting more economically exploitable land within their sphere of influence, recognise and fund these rebels. Throughout the conflict, the notion of an encompassing Maya identity becomes so deeply entrenched that the new nation's collective identity is well-formed by the end of it. The people's history as Mayans, rather than as hispanicised (ex-)colonial subjects, is deliberately accentuated both during the conflict and afterwards. To the Mayans, the post-Spanish (but definitely Hispanic) countries that formed (such as Mexico) were just as colonialist towards them as Spain ever was, so they accentuate their pre-colonial heritage to stand apart and legitimise their independence.
In the end, the countries afflicted by this mass rebellion go through a very bad decade(-or-so), and ultimately throw in the towel. The Maya state is recognised as independent, merged with British Honduras (modern Belize; also Maya-populated), and placed under British protection. The economic exploitation by Britain is rather irritating, but at least the Mayan inhabitants don't have to fear cultural genocide anymore-- and the protection of the British navy is a deterrent to attempts at re-conquest by the neighbours. During some later wars, Maya troops fight for the British Empire, a bit like the Gurkhas of OTL. When colonialism fades away, the Maya state becomes a loosely affiliated member of the Commonwealth (or ATL equivalent), and feels pretty good about its historical choices.
The tourism business is booming in modern times, even moreso than in OTL. After all, the Mayans deliberately stress their pre-colonial heritage, and this brings in lots of tourists. Having been a unified British protectorate for so long has kept the region tranquil since independence, which has boosted socio-economic standing, and makes the country a beloved destination for travellers from all over the world. Not to mention the fact that the special relationship with Britain makes it the place to be for any Brits who want a tropical holiday.