"Latine" (with a long e) or just "Latin" works fairly well in the language if one absolutely must avoid the collective-o ending, as in "Latine intelligente." Still a tad awkward, but leagues better than "Latinx", which is such a blatant violation of Spanish phonotactics and aesthetics that it bugs me, a white AF grigo.
"Latinx" was so obviously created by an English-primary speaker.
"Latinx" was so obviously created by an English-primary speaker.