Chances are zero, or as close to zero so as to be essentially zero.

It would need to be a near apocalyptic shortage before AA, UAL, DAL or any others go that far. Euro land rules are soooo different, that only Captains and FOs with large amounts of time (by Euro standards) would meet the requirements, and most of those would turn their nose up because at that stage, they're probably doing pretty well at home and would turn their nose up at anything that wasn't a direct entry PIC position ("what? I have to start at the bottom of some list?")

Euro style "cadet" or "self funded" programs are a non starter in the US because of the ATP rules. Those aren't ever going to change.

That's just the technical quals. Says nothing of the visa issue, which is challenging. Comparing it to Aussie rules is apples/oranges, since the Aussies get a special visa deal for being best buds with the US.

Euro military types are welcome right now if they can solve the visa issue. This is pretty ironic because they're time is not all that appreciated by airlines on their home turf like they are here.