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I'm not sure what you mean by "AI". There are no rules for artificial intelligence in the core rules (though I did not look elsewhere).
Assuming you mean an artificial personality: As BigNorseWolf said, the action economy is not something that should be bypassed with rules hacks. If time is a factor (i.e. in combat) then you could instruct one computer or the other but you don't get two shots for free.
Languages the computer speaks: That's a good question and not addressed in the rules. One option is to say that the artificial personality upgrade allows it to interact in one language, and if you pay again, you can get more languages. Personally that seems a little steep, and if it were me I'd discount it from the 10% base price. But you're in homebrew/GM call territory.