If you read OFUM and HFA in particular (which you should!), then cross-reference the names of students with the names of PPC agents, you'll start seeing some overlap. IRL, this is because the kind of people who enjoy OFUs are also the kind of people who enjoy the PPC, so plenty of people who submitted fanbrat versions of themselves to be OFU students also wrote versions of themselves as PPC agents. Sometimes those characters were explicitly one and the same, sometimes we've assumed so after the fact. Either way, we must then conclude that the PPC indeed accepts agents who were OFU students. {= )

In-universe, the PPC has a notoriously high turnover rate due to agents going mad or getting themselves killed, so they'll pretty much take anyone who isn't a blatant Suvian or so evil they'd do more damage to the PPC than to their assigned targets. World One teenager with no practical experience? You're in! Ancient Scythian warrior with only the barest ability to read and write in English? You're in! God-like being with semi-phenomenal, nearly cosmic power? You're in, too! Just don't go glittering up the place.

This is one reason that field agents get partners, so that if one of them has a glaring weakness, the other one can make up for it enough that a mission isn't automatically doomed to failure. So, if an OFU graduate has done well enough that they know that one canon really well, but is clueless about everything else, they'd likely be paired with someone who doesn't know that canon at all, but makes up for it with knowledge and skills in other areas.

Of course, their respective ignorance will also get on each other's nerves, but that's beside the point. {= )

I don't have evidence for this to hand, but it wouldn't surprise me if a high proportion of OFU graduates became Infrastructure agents rather than Action agents, anyway. Having learned what bad writing does to canon through a year of Learning Through Pain^™ may inspire some to support the Canon Protection Initiative, but that doesn't necessarily mean it also inspires them to take up arms, whether because they can't see themselves killing even a Suvian or because they don't fancy more pain.

In summary, the PPC is a loose enough setting that you can justify pretty much anything with a bit of imagination. It's also been around long enough that someone has probably tried whatever you're thinking of at least once before, so the precedent is out there for the finding. It's worth doing your own research to see how it was done. That way you can see what about it worked and what could be done differently.

~Neshomeh

...where they can tag along with agents on missions and get training in the field for working at the PPC full-time post-graduation.