A solution in search of a problem?
Or,
Matthew wrote his gospel in Hebrew (some word plays and puns work in Hebrew, but not Aramaic).
Mark’s work was in Hebrew also (see Carmignac, Birth of the Synoptics) but translated into Latin while he was with Peter in Rome; and then finished after Peter’s death with a Greek version (perhaps in Alexandria)
Luke — ditto, using Hebrew sources, except for the introductory words (and using Mary as a source for the early portions)
John — ditto (See, The Hebrew Christ, by Tresmontant)
-and written very early