Expresso? The x spelling has considerable historical precedent (2014)
slate.com
slate.com
The complicated part is that even though we do have roots that preserve the x spelling and the /k/ pronunciation -- "express" and "expression" -- we don't have the Italian "-esso" (or Latin "-essus") ending, so when we use the "-esso" it seems we must be borrowing an Italian word, which it would probably be most natural to borrow with the Italian spelling and pronunciation, unless we want to say "a pressed coffee" or "a pressed-out coffee".
One of the Romance languages that didn't lost it is Spanish, expresar is pronunced /ekspresar/
Portuguese has lost it in pronunciation but not spelling (unstressed ex → /iʃ/).
(But I should be careful generalizing about some of these things because sometimes you have later scholarly borrowings from Latin, so you can have some words with the modified original root and then some words with the re-borrowed root, maybe with a different pronunciation.)
The x spelling is correct in French. At least some of the article's evidence for the 'x' spelling appears to have arrived in English through French rather than the original Italian.