Given its strong Latin content, vocabulary, idioms and perspective, it almost certainly has no direct connection with Judea
We have discussed this over and over again. The idea that Mark is the foundation of Matthew and Luke is hard to contest. Nevertheless there is an inherent laziness to assume that the collection of gospels graciously preserved for us by Irenaeus and company is as a result of 'accidental' or dictated by accidental circumstance. The Latin content is also there. But if the collection was 'accidental' - if we have proof or even reason to believe that some innocent party just 'discovered' or 'collected' Mark, Matthew and Luke through innocent happenstance we'd have reason to naively accept that Mark (man or gospel) was Latin. But there is enough IMHO to make us suspicious of this scenario, most notable Secret Mark.
In the Letter to Theodore there is an allusion to the Carpocratian influence on the gospel of Mark as received outside of Alexandria. The only historical Carpocratian we know of was Marcellina. Evidence of her presence in Rome comes from an early enough period that it would be reasonable to accept that our variant 'canonical' gospel of Mark was written by that circle. I don't know why the group was associated with 'Carpocrates' or 'Harpocrates' but the evidence is also attested by our earliest pagan observer Celsus who likely lived in Rome.
The bottom line is that Latin content goes beyond the gospel of Mark. The same 'Latinized Greek' defines the very Christian identity (= Christianus'). This (according to the typical naive i.e. 'history innocently handed us these fucking texts' POV) has no direct relation with Mark (man or gospel). This seems to suggest to me at least that the culture of orthodox/Catholic Christianity was associated with Rome and this unusual Latinized Greek. Similarly the formation of many of the appellations which define 'wrong Christianity' (= the heresies) also exhibit Latinized Greek stems. Is it coincidence that both 'orthodoxy' and 'heresy' exhibit the same association with Mark's Latin content? I think it is naive to think so.
Irenaeus also speaks of coming to the 'brothers' in Rome from formerly association with another group outside the Roman fraternity. Polycarp's run in with Anicetus also speaks of a firm and early fraternity of Roman Christianity. The controversy over the calculation of Passover further emphasizes this.
If Mark's text 'just so happens' to reflect this Roman association odd that Mark should so intimately be associated with another local - Alexandria. The Romanness of Mark helps the process of undermining Alexandrian association which clearly would display better Greek, erudition, education etc. Clement does make mention of an association between Mark and Rome but even that description doesn't go so far as to suggest Mark's association with and of the text's 'Latin content.' Mark just happened to be at Rome when Peter was there.
The Alexandrian church clearly thought it knew a longer ur-Mark text and that a variant shorter text of Mark was associated with Rome. This Roman Church not only defined orthodoxy and heresy with its 'Latinized-Greek' but also the gospel of Mark. Not surprisingly there was a great deal of controversy over the proper form of the gospel of Mark as well as the gospel of Mark itself to such an extent that it is the least cited gospel text, almost never forms the basis for a Commentary. It would seem to me that a more reasonable reconstruction of Patristic sources would argue for:
1. rival claims of 'first gospel' between an Alexandrian Mark group and a Semitic gospel (Hebrew or Aramaic)
2. the job of Irenaeus was somehow to find an ecumenical 'solution' to the dilemma
3. the Latinized-Greek was deliberate inserted into the text to define both the text and Mark in a certain light (away from the traditional model).
“Finally, from so little sleeping and so much reading, his brain dried up and he went completely out of his mind.”
― Miguel de Cervantes Saavedra, Don Quixote