I'm writing up a proposal with regards to AP training and this number was an item I was looking for.

You would have to search WMIRS for missions
that you know contain those sorties, which also pre-supposes the aircrew is tracking them as such.

^^^ This. I've trained some but you'd not find anything like that. You would just see new APs.

I've done training missions for AP and MS as C-12s before. Going to be hard to find the stats.

When we put SAREXes into WMIRS, we enter the mission type (GT, Air, Combined, AP, etc.) in the Mission Name field, but it doesn't always happen. Mission symbols by themselves aren't specific enough.