Only one of these are primarily a people problem (and in the same category as excessive use of ascii art or characters for ~*pizzass*~.
A screenreader should be able to signal that a whole block, not just one symbol at a time, is "foreign" (e.g. "Hi! I'm [VAI BLOCK ANDURE END BLOCK]!", but preferably something less crap ass), and emojis should have more accessible descriptions, adjusted for mixed use and not just standalone imagery.