Nothing wrong with taking cadets, in fact assuming you have a valid training system, you get a chance to form them from the beginning. Plenty of successful and safe airlines such as KLM/BA/AZ etc have always done so.
Throw them in with a good mix of ex-GA (who have survived the bush, or PNG, or students trying to kill them) and ex-Military (who literally had to survive people trying to kill them) and the resulting stew is quite solid, with everyone ideally benefitting from the variety of everybody else’s background. Who gives a toss about where they’re from, I’ve seen excellent (and marginal) pilots from everywhere, it’s a matter of aptitude and attitude.
Even better, ensure their career follows a logical path: start off as longhaul S/O, followed by cutting their teeth on a 320 shorthaul into China and SE Asia. Then, after a suitable period of multiple sectors a day in all sorts of weather and plenty of hands-on exposure, back to longhaul as an F/O.
This would all be perfectly possible and ideal from a safety/quality perspective, unfortunately in the modern corporate environment cost-saving tends to trump everything.