I am against this. MENA and Latino are cultural umbrella categories, not racial categories.
What is the difference between a cultural umbrella category and a race? There's no scientific definition of race, and the most practical use of the Census racial data is to be able to ensure political representation is in line with the Voting Rights Act. And at least for that purpose, wouldn't having a bigger number of more specific racial categories be more useful than a smaller number of more general categories?