As for fitting AAMs or AGMs, the question is why? The PC9 is too slow to intercept anything worth intercepting and the lack of miltary radar make it a moot point anyway because without it they wouldn't even be able to find the target.
It's all pure fantasy I'm afraid.
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There is a limited 'point defence' scenario where AAMs might be a useful upgrade, e.g. Summit/VIP visit where an unauthorised aircraft on a potential suicide mission could be tracked by Civ/Mil radar at Dublin Airport and where a PC9 on point duty at say 5,000' could lock-on an AAM at a range of several kilometres, and even if the approaching aircraft was at jet speed a guaranteed hit could be made. With .5" machine guns with a range of 2,500' you might be lucky to get one accurate burst off, which will not necessarily stop the rogue aircraft. Would be interested to hear a military view on this.